I wouldn't want to date someone who was transgender. I also wouldn't necessarily want to date someone who was black. I also would not particularly care to date someone who is polynesian. I am fully prepared to be flamed.
The interesting thing is, one of my very best friends is openly gay and several of my closest friends are black. My brother-in-law is mixed race, my cousin is korean, my other brother-in-law is mexican. And it doesn't end there.
And if my daughter wanted to marry someone who was black and my son found happiness with a transgendered individual I would welcome them into my family with open arms.
But everyone is entitled to their own preferences without being labeled for them. No one should be forced to go against their own preferences just to prove they are pro-whatever. People should be just as tolerant of other people's preferences as everyone is expected to be of everyone else's race, religion, gender, sexual preference, or whatever.
Of course if one's preferences leads one to do harm to others, that is another argument entirely. I am just addressing the whole "would you date" comment.
But to hell with purple people, unless they are suffocating, then help them.