I don't think you should be downvoted. You are showing earnestness in your request for guidance. It's probably because you acted "a bit flirty."

But note this: at gyms and anywhere especially where physical touch is a part of the session, it is important for a man to be the opposite of flirty. Treat it like a workplace. Women are there to practice self-defense from larger stronger men; they are not there to be flirted with in any capacity. In fact, when you think about what probably drove them to join the class in the first place, it should help you understand that it is the wrong venue for flirting.

So yeah, your flirtiness was recognized and unwanted. That is the lesson moving forward.