I don't know why it's frowned upon to like females with just 1 thing different about them
- blackierobinson
I'll attempt to break it down.....
A lot of us still hold onto remnants of a recent traditional past with regards to masculinity and typical men's behavior. One of the great bastions of this particular brand of masculinity has always been his (hetero)sexual prowess and ability to attract women. A tie-in to that is that femininity is seen as weak, particularly in the case of a man perceived to be feminine. Homosexual men are often tied to male femininity, which when you add onto the already detrimental attitude of homosexuality being seen as deviant, doesn't bode well for not just gay men, but men who are otherwise perceived to be homosexual in some fashion.
Now, we understand that there are people who have issues with the standard definition of gender, and attempt to live out a different life for themselves - whether that's transmen or transwomen. For all intents and purposes, there is a newer understanding amongst a growing number of people that seek to lessen the trauma for those transgender people by referring to their preferred gender rather than assigned at birth gender. Trouble is, a lot of guys brought up still retaining traditional masculine values or indeed valuing them, did not get the memo
So if a guy who is generally attracted to women, finds a transwoman attractive until realizing it is a transwoman, leaves himself open to ridicule for being a "fakkit", or being "gay" and ergo "weak" or a "deviant". Whereas, the person identifies as a woman, and the man initially sees her as a woman not as a man. That doesn't matter though, because according to a lot of guys, you're still a gay dude, or on the DL if you fukk with them. And that's considered a wrong to some, or you just can't be considered as straight according to them.
There's a reason why gay dudes don't date transgender women: They are not attracted to women and ergo, they aren't interested in women born as men who identify as women

. The only potential men who would be attracted to transwomen are straight men (yeah) and otherwise pansexual men. For some of those men, the penis wouldn't bother them, and I don't see the issue with it

. It's not my thing, but I'm a compassionate person and everybody needs love IMO.