people know that symbol as a symbol that Nazis used

I didn’t, and, while I’m not an expert in nazi iconography, I do know my fair share of symbols and dogwhistle phrases associated with them and other white power/neo nazi groups; a lot of new ones thanks to this administration posting them to xitter.

Perhaps I recognize it because my dad watched WWII films/documentary as a kid.

And here we have it. Your dad exposed you to information the average citizen does not possess. Your anecdote is not representative of “most people” as you said it was.