Tumblr sees a man who knows how to color coordinate and be like, “there is no other explanation for this except that he likes to choke on cock for dinner!”
“There is no straight/heterosexual explanation for this” is just the woke version of saying “gaydar”.
And then you have the opposite extreme, where an actual gay or bisexual man is “determined” by Tumblr to be straight because they’re not a walking stereotype.
You’re right, how could I forget?
It’s either because the person isn’t loud and proud enough for them to remember they’re not straight or they don’t want to “claim” them because they don’t agree politically or whatever.