I agree that no one should be disrespectful to you because of your opinion, but please expect the same of yourself as well.
Regarding your experience at the club in Dallas, it is an anecdote. That doesn't mean no one should believe it happened, but it does mean that we should not assume this is the norm. Anecdotes are powerful because we see them/experience them ourselves so it has a stronger effect on us, but we should not take anecdotes and apply them to the population at large. Not allowing your gf to go dancing because of situations like that Dallas club is like not allowing her to fly because MH-370 crashed. Is there risk? Of course. Is there so much risk that it shouldn't be done? I'm skeptical. That said, anecdotes or not I don't begrudge your doing what you want in your personal situation (our experiences shape our decisions and that's normal), but I'll always push back when people advise others to take a negative view of salsa environments in general.
I don't want to seem like I'm humblebragging, but guys hit on my gf all the time. Yes, at salsa events, but everywhere else too. Starbucks, train station, etc. She once got a flat tire on the freeway and had the highway patrol officer who stopped to help try to get her phone number. She lives in Japan now, so we are very rarely with each other, and I couldn't keep her from doing something she wants to do even if I wanted to. It's natural to feel some apprehension when you're not around your significant other, but when you live on the other side of the world from them you learn how to just let them take care of it. Believe me, I get where you're coming from. But from my current perspective of knowing I would go insane if I worried about all of my gf's interactions with guys without me around, it's hard not to take the "just let her do it" side.