I'm in the computers industry and I would say about 80-90% of the people in my office are male. Fortunately for me, my new employer is rated 100 on the HRC Corporate Equality index. Part of what makes that rating is based on the fact that we have non-discrimination policies that include discrimination based on gender identity, as well as transgender inclusive insurance (to cover the costs of therapy, hormones, and srs).
I do wonder how much I'll be putting the non-discrimination policy to the test though since the location I'm at is only a couple years old and is based in Utah. I plan on keeping records of everything just in case.