I think it's because that rage-bait post was packed with stereotypes and insults. It probably ran into rules 2 and 6 (respect, no trolling).

Which post was that?

So much material to troll them right back

They deleted one of my posts too and even threatened to ban me. I did link an Instagram account, but it was clearly useful content directly related to this sub. I get it… but the guy wrote something like “REPEATED SPAM BAN! DELETED!” in all caps. I'm not even sure what that was supposed to mean. It was the first time I'd ever posted a link here, I'd never seen the woman I posted about on this sub before, and I'd never had a post deleted or dealt with the mods at all. I guess he just felt really powerful in that moment. Honestly, I felt kind of embarrassed for him.