Hi Radar,
I know I will not much help but it depends from job to job, state to state and country to country. In Australia, at least in my state, it is illegal to discriminate against TG people. Go to jail pay a fine or whatever. What legal protection actually helps is a moot point. I employ people regularly for a variety of jobs in my industry. If I don't "like" someone I can always find an excuse not to employ them on perfectly legal grounds.
The best thing you can do is be really good at your job. I don't fire good people. I fire the unsuccessful. I know I may be in an usually tolerant situation. But I really don't give a damn about colour, sex, religion or age. Although I have started to discriminate against child bearing age females. This was after I emlpoyed one woman for a maternity backfill, who when she got the job said she had become pregnant through IVF. I was not happy, two weeks into the job? So I had to pay her maternity leave and back fill the position again. And she came back and got preggie (IVF) again, I've paid for her child support, and she is receiving child support from the Govn't leagllay
Sorry Radar this turned into a bit of a rant.
Please forgive me
Cindy