I know most folks that hold the "I don't like trans roxy11!!1" opinion are definitely shitheels that don't want anything to be different or complicated ever, I've 100% seen people be like that. That said, and this is probably a result of me liberally blocking people on tumblr, most of what I've seen (recently anyways) is some folks thinking trans masc Roxy conflicted with some subtextual stuff that might have pointed to a trans fem Roxy. Not saying thats my read on the character, but I know its one I've seen from some folks, especially other trans women. Definitely a minority voice in that sea of discourse though.