I'm a tall guy (and also very muscular to be honest). I know (most) girls luckily like tall guys. However, the other day a girl told me I was TOO tall. It made me kinda insecure. I'm 6'6'. Is that TOO tall? I'm primarily interested in what you girls think. What do you think the best height for a guy is?

As long as you stand up straight and dress appropriate for you height, I think you're fine.
You seem normal to me.
But still, most women prefer guys who are 'too tall' over guys who are 'too short' (it's not fair, but that's how it is)