The problem is that, wherever there is a pattern, there are people who exploit it for personal gain. Creepy gym bros are a problem? Set up a fake one, get clout. It can turn real problems--like men harassing women--into things like men being called pedos just for being near small children. If it helps, OP, it's not your fault. Some people are just dicks. You should be proud you're open to helping others, and not lose that impulse--you're going to be a big help to some actual beginners who need it, and that'll do more than she ever could.

You were tricked into seeming sexist? Post a link to the video and let us be the judge.

that is legitimately lawsuit worthy. you can, and should sue her for defamation. this gym bimbos need to stop trying to ruin a guys life for attention

I'm impressed how fast the video editor worked. Usually, they'd have to work with a producer and a director, and then storyboard the idea, bring in a continuity editor, and so on.

I’m sure the gym has security cameras. See if you can get a copy of her approaching you first, bonus if it has audio. Sue for defamation if necessary.

editing programs for phones don't let you do much. I'm wondering how much editing was needed.