As for individual posts, MN only deletes them if they're reported. Only then only some.
If people who do make transphobic comments, can't even see when they're being transphobic or refuse to believe that they are even when pointed out, how will they ever know to report them in the first place?
MN deletes anything that actually is transphobic. Maybe its your definition of transphobia that is the issue here. I have yet to see a transphobic post left to stand. And actual transphobic posts are very rare, and usually by brand new users, who are generally shown the door pretty quickly as its obvious they joined solely to be transphobic.
And I wouldn't expect people to report their own posts, which seems to be what the second part of your post is saying. Many FWR members DO report transphobia though, sometimes so many the MN has to send a mass email to reply to all of those who reported. I am guessing from the tone of this post that you believe many FWR posters to be transphobic, but think MN just ignores the transphobia reports. Nah, they do delete transphobia.
When people plop onto threads to talk about how so many posters on the thread are transphobic, they can never give even one post from the thread thats transphobic. Its so odd really. if you are posting somewhere to point out the bigotry on said thread, then actually quoting the bigotry would be easy, no? Its not though, as the transphobia does not exist.
Anyway, last post on the thread, just didn't want to leave while that reply was there to me.