Why are transgender people not accepted in society?

Dont get me wrong lesbians, gays and bisexuals get a hard deal too but i feel like transgender people are so singled out and looked down on, i used to know a guy who truly felt he was a girl in a man body he would wear makeup and girls clothes and on one incident he was approached by a hate gang and was bottled and beaten black and blue simply because he was transgender, when will this ever stop? Why do people act so harshly to something they might not like or disagree with?
Why are transgender people not accepted in society?
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