I was going to say that this doesn't quite answer the initial question of "if he didn't crossdress, would I still like him," but I guess in a way, it does. "I started liking him because he was cute, but then he seemed cuter because I liked him" is a good enough response while they are in high school. So if the others reach like Social Rank Whatever, they might start liking each other for their personalities and mannerisms more. Cat Ears is the only one with a huge gap in personality, and he already has a loving boyfriend.
That's way oversimplifying it, but hey they're high schoolers in a society that doesn't have much exposure to sincere LGBT themes. If that is the explanation they're most comfortable with, then they don't need to worry about it until later in life. Because this is a manga, high school lovers will probably be together until they die