“Never get in fights with pigs, you get all dirty and they enjoy it.”
I love this one. Like all humour there’s more than a grain of truth in it. Too many times I’ve come out metaphorically bruised, from a discussion (?) with someone who turned out to be totally fixed in an illogical mindset, and simply not prepared to listen to reason. Some people even throw out bait to try and draw you into an argument. I’ve learned the hard way, not to take the bait.