The answer to this is complex and nuanced. First, most reasonable people do not shame anyone for their body preferences- period. It is often more about how tha

The answer to this is complex and nuanced. First, most reasonable people do not shame anyone for their body preferences- period. It is often more about how than what. You may prefer someone who is taller, shorter, larger, thinner, etc. But if you talk in absolutes, like "Tall people are ugly" then certainly you'll receive criticism. And this of course leaves people feeling hurt. When I was active in dating, I wanted to date women who were attracted to thinner or average men, while I'm overweight. It hurt, but I accepted it. That said, there are some, very tiny minority of trans people who are upset that in not being eligible for dating someone based on body preference speaks to their being perceived as their gender. "If I'm a ___, why would you not date me as such?"- and their answer is "Because you do not percieve me as my gender presentation". Sometimes these people are loud and aggressive in their objections. At the same time, it's also a fact that this is a tiny minority of people, a very tiny minority, and it's used largely as a way of amplifying a problem that largely does not exist- it's a strawman argument which does exist to some extent, but is much smaller than it's being portrayed. Like I said at the start, it's complicated, but it's largely a justification to be hateful on JK Rowling's part.