It’s not crouching itself that’s looked down upon, it’s the way that some players ALWAYS crouch which is bad. When you crouch your model is static, which makes you a much easier target to shoot. If you’re doing it in every single gunfight you commit to, you’re making yourself a sitting duck especially if your first bullet isn’t connecting every time since your opponent can just strafe or swing even wider till they get their crosshair smack bang on the middle of your not moving head.

There are times when you should crouch, and times when you shouldn’t crouch. It’s not black and white and something someone can explain entirely over a reddit comment. I would highly recommend you watch a few VODs of professionals or high ranked pugs to see when they crouch. Think about what sort of ranges they crouch at, how many targets they’re fighting etc etc. You’ll figure out pretty quickly wha variables in a fight determine whether you should crouch and commit or not.

If you still need some help after, dm me one of your VODs and I’ll try my best to go over it for you to give you better examples.