Hmm. The question was phrased tactlessly, but it's quite possible that the intentions were good. When I ask a lady I haven't met or seen dance before for a dance, I sometimes ask (after we have started dancing) an innocent-sounding question like, "So, how long have you been dancing?" .
I've had guys ask me something along these lines and I would swear they were just making conversation. Like any other activity where you might use the activity itself as a way to get a conversation going... "So, how often do you hike? Have you climbed this peak before?". "Do you belong to a league at this alley or do you usually bowl somewhere else?". "Are you in the figure skating club here?"
How long or to what extent you've been participating in an activity is usually considered a "safe" topic of conversation at that particular activity (certainly better than saying "Can you believe they elected that
MORON?")
Its just the tango equivalent of "Hey, Babe... Come here often?"
Its just in the dance world that people feel it slights them to be asked this question, it seems.
I would prefer that people not ask me this or any other question as we start to dance. I can't talk and dance at the same time. But you can usually tell when its an attempt to make conversation because
A) the person keeps trying to use the tanda as a way to get to know you through conversation even though it prevents both of you from dancing well, and
B) really good dancers don't do this because they know you can't talk and dance at the same time and that you "get to know" the person ONLY as a dancer, by
dancing. If you are there to "hook up" you don't do it by talking except BETWEEN dances.
Its usually inexperienced guys who ask me this and they are learning the dance just to find a girlfriend (or 3) not because they care about dancing.
Or it is followers who are hoping that my answer will be that either:
I've only been dancing 6 months and they'll look like me very soon (if they are new) or,
that I've been dancing for 2 decades and that the fact that they still don't look like me is because they've only been doing it for 6 years (and they're crushed when I tell them I've been doing it for 5)
In other words, the guys don't really care about my answer and the women are hoping for a specific one before they even ask.
I've had the same thing in skating.. when others ask me how long I've been skating, its almost always a COMPLIMENT because they are
impressed by my skating, not a criticism. At least that's how I take it.
Or maybe I'm kidding myself and they ask because they've heard how long I've been dancing/ skating/ whatever and they don't believe it because they think I suck...
After all, sometimes,
I think I suck, and I ask MYSELF "HOW long have you been doing this???!!!"