Please tell me I’m not wrong.

So my SO and I went to a HOA friends house tonight and we were all talking and the topic of teeth got brought up. They were trying to open beers with their teeth 😩... anyways, I proceed to tell his friend he has “nice teeth”. After that my SO was very standoffish, rude and nasty to me. We left and I asked him what the issue was and so told me. I said are you kidding me? He said well i shouldn’t be dating someone who is such a flirt... am I a bad gf for telling him he had nice teeth??? Mind you he always thinks I want someone else lol.