Best Friends Boyfriend sent me a rude message.

So for the first time literally ever I’m going to a bar with my friend and her boyfriend wail my Mom has my son over night. Her boyfriend wasn’t originally invited because he hates going out and it was supposed to be a girls night but then of course he decided he wanted to go because god forbid he leave her side. Then last night he sends me this message and honestly I don’t even want to go now. I’m a single Mom and in the last three years I’ve been out of the house on my own about 3-4 times. I’m very anti social and it takes alot for me to build up the courage to leave the house and be around people (expcially stranger). Just so annoying. Probably just gunna tell her my Mom bailed honestly because I just don’t wanna hangout with him if he’s gunna be an asshole expcially sense I’m basically third wheeling like a lame person anyways.