Why are men trash

So I'm talking to a guy (not from here) and we were discussing Zodiac signs, he's a Scorpio, and I looked his up bit and then came back and said "Damn jealous and possessive, and says highly incompatible with Leo!" And then he said "Hmm I guess I'll just have to gaslight you into ignoring my red flags." BRO, WHAT? I've only been chatting with him for a few days and he doesn't know my relationship history and how very triggering and upsetting that statement is even as a joke but like...WHY WOULD YOU SAY THAT TO A WOMAN, ESPECIALLY ONE YOU JUST MET?