when the government goes after you for "body shaming", that is a legitimate speech issue and you should expect to win a constitutional rights challenge, so long as you are not breaking some other law in the process.

put another way: laws against "body shaming" are certainly unconstitutional and will be struck down at the earliest opportunity. but, that doesn't mean that it's ok to do things like film people in dressing rooms, or otherwise infringe on an individual's personality rights.