I am no expert on the field, but i think being transsexual (or basically anything other than cis) somehow has become trendy in certain circles. Also, and this is just speculation, but i feel like a lot of people have jumped on to the "gender bandwagon" because it boosts their special snowflake status and is a free ride up the progressive stack. Obviously i am not talking about those who actually suffer from gender dysphoria, but the ones who does it because it's "cool" and they get to play the victim card more often.
You also had the "kin people" who believe, or pretended to believe (i don't know really) that they are [insert]-kin which can be anything from animals to fictional characters and inanimate objects. I suspect a lot of these people suffer from some mental issue, but again, lately some are just pretending because it gives them yet another label to wear on their collar.
Then some smart ass found out: "Hey, i like x culture, that must mean i am trans-x". Free snowflake points AND you get to berate people for racially abusing you.