What should I do if I can't stand them?
Can you tell me more about who you can't stand?
I cannot stand my friend anymore. They keep pissing me off and are super rude about what I do.
While you are free to dislike people, you shouldn't tell this to their face because it is off-putting and bad manners. Just ignore them and get on with your life if you hate someone. You don't need to create drama.
You are mean too. What else can you even say to me?
It's best to just avoid people that you don't get along with. Telling someone that you can't stand them is hurtful and will create unnecessary tension.