That Maggie Mason sure says it well:
"Consider the source. If you’re worried about someone who dislikes you, first ask yourself whether they’re an asshole. If you don’t like them, and they don’t like you, that’s not a problem. That’s a mutual understanding."
I wholeheartedly agree. I'm also not gonna worry about it anymore. It's not me trying to convince this person that I'm sorry, here's the olive branch, let's make amends and start over at the beginning, only to have a nasty reply thrown back in my face. It's a mutual understanding. I'm glad we're in agreement.