I feel your pain. Learning the basics of IP law is one of those "curses of knowledge"[1] because you can never not sound like a pedantic asshole whenever someone who doesn't know IP law tries to talk about IP law. "No, it's not a trademark suit, it doesn't matter if they've tried to defend it before. What, why are you even bringing up patents, it's not a specific, narrow invention, and it would've expired decades ago even if it was. Ahhh!"

[1] https://xkcd.com/1015/