Whoever brought it up has some deep unresolved issues, however. Or was fishing for an argument.
EDIT: It's like fetishes. Preferences are fine and should be respected, but they're also better kept off private. Telling people of a specific ethnicity you're "into them" is also kinda creepy.
This was in the context one of those kink quizzes regarding what things someone was into, so genders, fetishes, bodily features, sex acts, etc. It isn't like someone just announced to a bar "I'd never date a transperson" out of nowhere.
I wonder what their position is towards someone who prefers trans people.
They'd consider it fetishism, unless said person was also trans and only preferred other trans people because of wanting that shared life experience.
Their point was that thinking of trans women as different to women as a group was inherently bigoted.
I'd say it is a probably a minority position but it is a genuinely held one