You may have real reason for disliking someone. He may be a bad influence. He may be corrupt and repugnant.
But as long as he is not actively tearing the world apart—if he needs a favor, go out of your way and do it for him.
First of all, he is still your brother. Secondly, you’ll be a better person for it.

According to our ethics, if your enemy is hungry you should give him food and this action will heap live coals on his head! That's not very friendly if one is supposed to express love for him!