Probably no one's following my internal debate over "virilismia" vs "transandrophobia" but I've decided to use virilismia for negative attitudes towards masculinization itself and transandrophobia for attitudes/arguments that feminize us.
Hm. I've got thoughts, but I'm not sure exactly what you're asking. Can these describe experiences/prejudices against nonbinary transmascs? (Absolutely) Does this cover all transphobia towards nonbinary people? (No) Should there be words to talk about the above? (Yes)