[04-13-19]

Nope?

Depends how they dislike you(?)

If they respectfully hate you quietly that's respectable. Don't engage or do so sparingly. Otherwise…

"I'm going to get revenge later" can be useful. Maybe just the thought if, you can take a breathe later and reassess.

"There's no time like the present"(?) assuming you can swing that.

Call them out on their B.S. "I know what you're doing." assuming they're pulling some passive-aggressive crap. I think that can have some advantages in certain circumstances(?)

"The best revenge is a life well lived." If you generally don't care and you don't expect reprisals with actual consequences you can bask in the hate and enjoy it.

Remember some external "MacGuffin" that makes it not a big deal. i.e. "X person likes me that's all that matters." "I have [some-such advantage] that's more important than [whatever issue is at hand]."

etc. etc. <shrugs>