ScreamingMeMe
Some people (especially men) seem to get the sports issue, but hand-wave away the rest of it. It's odd.
I was speaking to a friend a week or two back, and he seemed to get the "sex with him" issue. ie TWAW apart from in his bed. He has a friend who has apparently always been trans, brought up as a girl, is a woman in every single way and woman need to budge up, be nice and not make a fuss. But obviously he - as a straight man - would never sleep with "her" because "she" is not the right kind of woman for a straight male.
I find it hard not to find his viewpoint absolute incredible in how hypocritical and despicable it is.
The sport is a biggie, but I get them impression than many people (especially men) get the "I don't engage in sex outside of my sexual orientation" part of this. A lot of straight men seem to have a big problem with gay sex full stop... but pretty much every straight man has a problem with gay sex for them! (and obviously straight men who don't have a problem with gay sex are bi not straight.)