Sorry to resurrect an old thread but I disagree with the last few posts. There's nothing to suggest men's complaining resulted in the guard confronting those two. It's much more likely the guard noticed the behaviour was odd, and that they'd be at risk in the gents (or the guard has previous experience of women selling blowjobs in the gents, it happens). Either way I very much doubt a young man complained and that's the cause of the action.
Assuming that is the case when it not clear that it is means writing off the different reactions as just sexism: man complains and something is done, woman complains and is called a TERF.
Whereas in this case the guard is much more likely to have acted to prevent something worse happening, and looking out for the two. Because I'm pretty sure that as a security guard he would have seen plenty of examples of violence including possibly sexual violence.
So the question is why does this reaction not happen when a man goes into the women's? Well I think it does. A man identifiable as a man is challenged.
OTOH, a transwoman isn't seen as a man, not a proper, scary, possibly violent man, by other men. As per previous posters on other threads, men assume that giving up manhood to "downgrade" to being a laydee means that person doesn't have the cojones to be violent or sexually aggressive. This assumption, that "sissies" pose no danger, means women have a hard time convincing men we don't want them in our spaces.
I'd bet £10 a random security guard would have no problem chucking Danielle Muscato out of a loo, but would assume Jenner was ok. Because one has stubble and the other wears thousands of pounds worth of designer gear. Ironically the latter is probably much bigger and stronger.