F222, I don’t think anyone is arguing that Burlesque isn’t a form of using bodies for entertainment.
The argument is that someone voluntarily choosing to use their body for entertainment for an audience that has voluntarily chosen to be there can be empowering and a celebration of body positivity.
That is being differentiated from predatory or exploitative forms of sexualized entertainment where either the performer or audience is forced, coerced, tricked, or otherwise pressured into participating.
Your comparison to the rude joke doesn’t work here; the issue at hand isn’t one of intention but one of agency. Much like I would try to avoid a restaurant that mandated it’s serving staff wear mini skirts and high heels, I would never shame a server who chooses to wear that outfit because that’s what she finds comfortable.
As to your catcalling question, that is all about the context of the social space we are currently occupying. E.g. Generally, punching someone is considered unacceptable behavior. However, if you are a boxer in a boxing match, the social context has changed so that it not only becomes acceptable but highly encouraged to punch someone. That doesn’t change the fact that once the match finishes and you leave the ring it once again becomes unacceptable to punch random people in public, even if you encounter your opponent from the match on the street later that same day.
Similarly catcalling is (or should be) considered unacceptable behavior in public. However, when you are the audience of a burlesque show, you enter a social context where it not only becomes acceptable but highly encouraged to show your appreciation of the performance through vocal recognition that is indeed very similar to catcalling. That doesn’t change the fact that once the burlesque show ends it once again becomes unacceptable to catcall people in public, even if you encounter one of the performers from the show on the street later that same day.