You bring up some interesting points about transharassment by males. They are usually the most vocal and sometimes violent. And that's the irony!...
Discrimination is usually spawned by fear. People who discriminate usually feel threatened in some kind of way and it can sometimes cause them to act out.
In our case men think that we challenge their sexuality, if for only a second they think we're real or are attracted to us sexually. The reality is that if the're attracted to women and we "look" or "act" like women then that only affirms their "heterosexuality". (If thats the case. I'm just using it as an example)
But upon realization that we're not, thats where the hostility starts. Then of course there are always the 3 beer bi sexuals or ones who will come up to your when their friends aren't around. Give em a few drinks and they can't wait to get you in the sack.
But anyway....did we digress?