I was at a party and ran into a guy I used to flirt with. Nothing ever happened because he expressed zero interest in me. So, I never flirted again although we'd run into each other often.

We chatted for a minute and he reminded me about how I used to always flirt. I joked ot away, said it was good to see him, and moved on.

Later that night, I got a drunk text from him saying that I was rude and he knew he wasn't the hot guy he used to be etc but I didn't have to act the way I did. I didn't respond because I figured it was alcohol driven

The next day he followed up with a bit more strongly worded text. This time I replied that I wasn't interested in being his fallback now that he's not being chased by lots of guys. He called me an asshole and that ended the conversation.