He's talking science, measured outcomes, greatly increased risk of suicide with reassignment surgery, and evidence.
That this doesn't fit your politics doesn't make it bigoted.
http://journals.plos.org/plosone/article?id=10.1371/journal.... "It is therefore important to note that the current study is only informative with respect to transsexuals persons health after sex reassignment; no inferences can be drawn as to the effectiveness of sex reassignment as a treatment for transsexualism. In other words, the results should not be interpreted such as sex reassignment per se increases morbidity and mortality."
Further, numerous studies exist which disagree with the claims posted above:
http://dare.ubvu.vu.nl/bitstream/handle/1871/23255/189321.pd... "The results substantiate previous conclusions that sex reassignment is effective."
http://www.jaacap.com/article/S0890-8567%2809%2962807-0/abst...
http://onlinelibrary.wiley.com/doi/10.1111/j.1743-6109.2008....
What is known, is that "conversion therapies" are not useful. It's not possible to modify a person's sense of self, just like it's not possible to modify a person's sexual orientation.
Lastly, let's remember that slapping the word "science" on something does not make it correct. Everyone has a political agenda of some sort, and plenty of science has been used to justify homophobia and racism.
So, this is incredibly insulting. Try getting a decent job while trans. It doesn't happen. Trans people suffer from incredible rates of homelessness and poverty. The one niche that's allowed is sex work. You can bet your ass it's not some kind of weird sexual validation thing for most trans folk, it's just survival: http://www.lgbtmap.org/news/understanding-transgender-issues...