Del he didn't say that though. He really didn't say anything remotely like "I just don't want to smurf a trans person". He literally said that he believes trans people are "tricking" men into "gay sex", which is such a disgusting viewpoint that I don't even know where to begin opposing it. He's free to possess his views, and to express them, but this sort of thing is literally - I am not exaggerating, I am not misusing the word literally - causing trans people to attempt suicide. Or to be murdered by people who felt tricked or simply offended by the trans person. I don't think it is unreasonable to demand someone making claims that have such serious repercussions back them up.

13 Myths and Misconceptions About Trans Women: Part One - Skepchick

See points one and especially four.

"Dangerous in that a great many trans women have lost their lives to sexual partners who felt they were “tricked”."

He may not have explicitly said trans people shouldn't be allowed to exist or to have relationships, but that's the very immediate and obviously-traced consequence of what he is saying.