Why are some atheists so closed minded?

Not every atheist comes to that position through careful consideration of the alternatives.

Not everyone is kind and respectful to others.

Not everyone can cope with seemingly irrational or contentious view-points without feeling the need to be antagonistic.

Not everyone is tolerant of different belief systems.

That's why.

I'm agnostic, and I'll tell you that I honestly find militant atheists just as every bit annoying as religious fundamentalists.

The thing is OP, religious folk tend to bash athiests for not being religious. They call them "Evil Satanists" and "Lost Souls". So really, how can you blame athiests when they're victims of bigotry and hatred as well? It's a double-edged sword. Maybe if people learned to not judge someone based on whether or not he/she's religious (Or try forcing religion/anti-religion onto someone else), the world would be a far better place.

You see, most of these new age atheists are following the bandwagon of retarded hipsters who believe in the hype, just because it's something new, opposed to tradition. This whole new, "fuck the system" mentality has been taught to teenagers since the sixties with all their flower power shit. Teenagers are very impressionable, they follow trends, they create fads that last for a short while, then when they are bored of it, they invent another bullshit fad or trend to beat their chest for, in "solidarity" to their cause.
These are mostly immature teens who, in case religion would still be big, would obediently go to church every sunday because that is what the norm is. They're not atheists because they are enlightened or had given much thought to it. They are atheists because this is how it suits them better in order to accommodate to society's new standards. It's a lifestyle more than anything else.

And about what you said, about them becoming exactly how the targets of their jokes are (christians), is once again, an example of their ignorance and stupidity. If you don't honestly and genuinely believe in what you preach, you risk slipping into the other extreme, and become an immaculate reflection of your "enemy".

Cultural marxism can be partly blamed for all this stupid hypocritical, dishonest, fad building trend of embracing certain ideologies just because they oppose traditionalism.

The simple answer is because atheists are people, just like everyone else. Atheists are a minority that are harassed on a daily basis either overtly or subtly. It's understandable why some would come off antagonistic due to this. Not everyone can come with it.

If you're implying, however, that atheists are more likely to be close minded, I think you're fooling yourself and should take a look at religious folks. I think you'll find the numbers come out even at best.

The conflict between theist and atheist or believers and non believers cannot be avoided. Both sides wanted to prove something. Atheist believes in the saying "to see is to believe". There are questions left unanswered. There are questions still looking for truth. We have the word "theory", it means not yet proven, just constracting ideas, a may or may not be. One thing for sure is that both sides is searching for reality and truth.

"Religion and science are not odds, they just decided to work separately"

I am an atheist and i feel we are the open minded ones. The reason people mock religion is that it is so silly to believe in such things when then is so much evidence opposing it

It's the scientific method. Theists make a claim that a god exists. They have no evidence. Therefore I reject their claim. Since people's decisions are informed by religion, and religion is factually incorrect to the detriment of society (abortion, gay rights, etc.), it is important to spread the message. Of course no one should intentionally try to inflict emotional distress, but it's hard not to when trying to undo such a precious and closely held belief.

Since they bothered putting a name to something that didn't need its own category. I guess since we bothered naming them they developed this type of entitlement. Other then just being Non-religious. As well as that I have noticed a large majority of atheists are simply bitter and hated the practices as children of "Going to church, dressing for Sunday school, praying to god".

So they project this image of their parents and their churches onto any Christian/religious person they see. Even though in reality none of these Christians/religious people even know them and don't deserve the hatred they have for people who simply happen to follow the same thing.

Like saying "A black kid beat me up as a kid. It was a single black kid and I never see him anymore. For this reason I now believe all black people are evil and decided to become a KKK member". Which is sadly the logic so many of them follow.

You can see this in the rants they give when you question it and some of them will go off how THEIR parents made them go to church, and THEY hated attending something they never believed in, or how they never fit in when they went to church. Which is their own personal issues but they insist on making that butt-hurt everyone else issue.

you're probably asking for an atheist to be more agnostic by viewing them this way.

I'm an atheist and I am always open minded and respectful of others and their beliefs. Be careful when throwing around generalizations.

I think you are talking about atheists who are bitter at religion, perhaps something happened in their lives which has caused them to turn their back on religion and despise those who follow it.

There are always going to be those people in life, don't let it bother you. Have conviction in yourself and don't buy into the shallow and crass value in others. It only leads to frustration.