Men could be peacocks, looking for women who would befit their dancing prowess. I learned too, that you could look like the belle of the ball but if you don't dance like an Argentinean goddess, you're are dead on the dance floor. And word gets out. Some men will never ask you to dance though you see them week in, week out. You never know why.
Some men sit and nurse a drink all night and never ask anyone to dance.
It is moody. I got better at tango and finally ventured out to a soiree, customarily held in the same ballroom where courses are given. By day, tango schools are not too inspiring but at night, they heat up as the class wallflowers and the Walter Mitty men transform into divas and Prince Charmings. Unlike class, where you have a constant partner, at a soiree, a woman sits and waits. She may ask a man to dance but it is generally more acceptable to be asked.