When people talk about 'some posters' it is impossible for anyone to know if they are being targeted or not. If they try to answer the point they can be accused of seeing everything as being about them, and if they don't answer, the point is being made without opposition. It's not necessarily intentional, but is a very unfair debating strategy. At worst, it can look as though the poster using that strategy is too cowardly to name the person (or people) directly, so it's not great from that perspective either.
To be fair to Maremia, the OP didn't make the point about men versus women though, Molly. It asked if there was a lesson in the fact that someone had been arrested for impersonating a naval officer. I must admit that the parallel with men claiming to be women didn't occur to me until later in the thread (although it is a valid one in some ways).
If a man dresses as a woman, does his shopping, goes to the pub and comes home, I don't see any reason why he should be prosecuted. If he dresses as a woman and uses female changing rooms, examines women in the guise of a female doctor or turns up in a DV refuge saying he is female, there is, IMO, a huge difference. I am not transphobic - I just believe in single sex spaces being respected as such, and these days w need the law to uphold that.