I know no man who has, as it happens, but since I don't frequent the Gents my information is anecdotal not evidential. I have been asking, during the past few years when the hysterical "we have to use the ladies or we'll be beaten up" line was being put forward, and come up blank.
I think there were cases of gays being beaten up for either cottaging or being suspected of cottaging, back when there was also public gay-bashing which led to deaths, but that was really quite a long time ago now: fifty years or so. I suspect those cases may be why TiMs think themselves at risk, rather than anything more recent. (There was at least one gay killed some time in the late 1960s for propositioning a man who was aggressively straight, but I can't remember his name to look him up.) So many of the TiMs (and also TRAs) had not been born when the mere fact of being homosexual was a criminal offence, so beating up or killing a homosexual was not something the police bothered too much about....