Is anyone who doesn't fully understand & support Trans issues an automatic HP??

[traininthedistance]

OK, let's reframe the question: is somebody who refuses to respect another's personal decision about their gender an HP? And the answer to that, for me, is yes.

This is the correct way of thinking about it.  One doesn't need to "fully understand", whatever exactly that means; one simply needs to make a good faith effort to be respectful, which shouldn't be so hard.