I've noticed that when many transgender allies and even some transgender people themselves have their claims investigated that they, in my estimation, can never really answer them too adequately: one hears that one is the gender one is because "I identify as X"; one hears that "I'm this gender because it's what my feelings and or emotions tell me"; one hears that "gender identity has nothing to do with one's biological sex; it has everything to do with one's subjectively known sense of self". For me, these claims are somewhat problematic. Shouldn't there be an objective way whereby once can discover another person's gender identity, without explicitly asking them as to which they identify?
I have to also say that if gender identity is just subjective--- meaning that one is whatever one says one is, or whatever one feels oneself to be --- does that mean that one who doesn't feel human (like people who are otherkins don't) are not human in some way?