I really hate my boyfriend's brother
What do you hate about your bf's brother?
Why would I tell a complete stranger a reason which stays in the family.
It's always a good idea to get along with the family of your significant others. You should sit down with him and try to find something you have in common.
Fuck that this dude makes me stressed. I know he will be pissed by me trying to be friends.
Well you have to try something. You will have in your life for a long time and it is better to get along with him and your boyfriend's other family members.