I think, if asked that question out of the blue, I might answer that I was prejudiced. The question would annoy me enough to do that, because it’s ludicrous.
Most people don’t believe themselves to be prejudiced, other than on the level of acknowledgement that all of us are on some level, even if subconciously, which I would assume wasn’t the intention of the question, unless they asked exactly the same question about all the other groups.
So if the only group selected out for that question were “trans people” then I would assume those writing the question were prejudiced themselves, against people like me.
I find it interesting that so many people willingly answered that they were prejudiced and would wonder whether it was due to the same kind of reaction.
On top of that, there is the vexed question of whether I am genuinely prejudiced against “trans people” because the majority of visible people representing “the trans community” are men who dress sleazily and/or regularly show aggressive male behaviour patterns and misogyny, or are troubled young women with obvious mental health issues (see Stonewall employees during court cases, for example).
Though I remind myself regularly that there is an entire subset of decent, largely invisible people who would describe themselves as trans, I also fully understand the fact that some employers would disregard applications from people with pronouns on their CV, for example. We are so regularly presented with examples of troubled, angry young people, and the co-morbidities are so common among those who obtain medical help, that I can understand an employer taking a shortcut and deciding not to employ anyone who identifies themselves as part of that demographic. That is prejudice, but of a kind where (in my opinion) the situation is so extreme that it’s entirely unsurprising.
How to unpick all that is a very difficult question indeed.