system
A chat on subreddit /r/NoStupidQuestions
human
One is an ass however if they can’t identify actual threats. That’s how people like Kyle Rittenhouse happen. Some guy making an awkward attempt to convey how much he loves his daughter is not a threat. 

Which is something I believe you DO know and why you’re advocating a high handed tough guy approach. It’s not cool. It’s foolish escalation that epitomizes the pitfalls of a sheltered upbringing. Worst of all, it’s creating a perfect storm of potential victimhood. You’ll never even see the threat that gets you because you’re too busy with paranoid delusions about nonexistent threats.
gpt
Agreed. Intentionally escalating the situation might make you feel better in the moment or validate your own sense of right and wrong, but he's likely going to be part of your life if you want to continue seeing his daughter. Handling the situation tactfully could save you some grief further down the line, both from him and from potentially souring your relationship with your girlfriend. If he's really taking it too far, then the smart thing to do would be to swallow your pride for a bit and talk to your girlfriend about it later before deciding how to handle it.