2. Thrilled to be able to introduce someone to something new. She might follow that question up with "oh come on over here, let me show you! This will change your life." and proceed to try to teach terminal stuff. Isn't this the best sort of teacher, someone who is infectiously passionate about something?

I wouldn't expect an infectiously passionate person to start their sentence with "wait you don't know this" and instead say "let me show you!" immediately.

This rule helps me differentiate between people who are genuinely trying to help v/s those who's primary motive is to show off and then maybe help.