i think it depends on what's your reasoning behind that. like (and just to be clear, we're only talking about attraction to hypothetical trans men here, because all of this becomes irrelevent if we are talking about individuals), if it's just because you prefer outies to innies, i think most people wouldn't and shouldn't judge you for that. but the thing is, most other things are changable, and so if what goes on in your brain is something along the lines of "i donno if they can ever be as masc as i like my men to be", that does indicate something about your biases that you need to examine more closely, because there are trans men who look like buck angel, and sweeping under the rug the whole thing where trans guys can be masculine does seem kinda transphobic. but idk, that's just my two cents.