Is it normal i don't plan on befriending mentally ill people anymore?

It's good to cut off shitty people regardless of whether, or not they're mentally ill.

In my experience they always ask for ridiculous stuff and expect you to always say yes because of their mental illness. As if I'm going to waste my life just to do their chores everyday and cancel my plans anytime they need me

As someone who used to befriend a lot of troubled and mentally ill people and did my best to help and be there for them, I can't say I blame you. I'll always wish the best for them and don't mind helping them if they're also willing to help themselves and accept the help, but in my experience, that sadly hasn't been the case. It's not uncommon for these types to bring you down with them and have overly high expectations for what you can/should do for them.

While it's great to have a big heart and try to help those you can, it's not fair to yourself to set yourself on fire in order to keep others warm. At some point, if the relationship isn't beneficial to both people, it's best to part ways. Not to mention that you can't always help those kinds of people and what they really need is professional help. I don't mind supporting them from afar, but typically don't get very close, and some I've had to cut ties with completely (one in particular I had to due to concerns for my own safety).

I also think that if your gut feeling tells you to be cautious of someone, it's best to follow it, regardless of whether they are mentally ill or not. In my experience, my gut feeling has never been wrong about someone.

Not normal.

Being prejudiced towards people with mental issues is not normal. It actually shows you have bad character and lack empathy, which makes you a shitty human being altogether.

Yes.

Now I'm not saying that this is the case for every mentally ill person, but there is a chance a mentally ill person will screw up your life, just like they screw up their own lives. The multiple people I have known with mental illnesses were nothing but an annoyance. A bunch of delusional cunts.

You shouldn't associate with anyone who takes advantage of you or uses mental illness as an excuse for their shitty behaviour, especially if they show no signs of trying to change it.

I used to put a lot of time and energy into trying to help people I knew to get better and be there for them. Eventually I just had to cut them off because they weren't willing to help themselves or accept my help, and would instead continue to try to bring me down their level or insist on complaining about how bad their life is without doing anything to improve their situation, which started to take a toll on my already poor mental state at the time.

Show me your friends and ill show you your future

That's fair.