Lewd space program.
Shemale is an offensive term towards trangenders. That would be like going around calling black people the N word.
yeah.. no, it's not the same. one is racist the other..well Shemale male turned she. saying trangenders doesn't erase your gender.
Actually, as a transgender girl, I can confirm that shemale is a slur. I could explain beyond that... but honestly just googling 'why is shemale a slur' will give you more than enough explanation.