Hate to say it, but your gear was probably somehow inappropriate at that time, I agree you should go back and find out if they are still interested. Or whatever.

Don't change your time go back with the intention of meeting this head on. Keep an eye out for them doing it again, keep working, look directly at them (eye contact), smile and gently nod your head (as if you were saying 'yes' to a question but you don't want the whole room to know). If they complain about anything just say it's how you workout. But hopefully you'll end up doing a train on them :D !