Literally the only place I have ever experienced transphobia on Lemmy was from a hexbear, who called me a chaser for saying that my ex was a trans woman.
Calling someone a chaser solely on the grounds that they claim to have dated a trans woman could imply "no cis male could be interested in a trans woman outside of pure fetish bait", which is awfully reductive. It casts the trans woman as an object in the relationship rather than an equal partner.