The original commenter @cumskin_genocide@lemm.ee did neither specify their own sex nor the gender of the people they tutored.
Multiple people under that comment simply assumed that OP is male and was tutoring girls. That is heteronormative. Yes, I formulated that with a bit of snark. But come on.
I’m pretty sure thats due to how mastodon renders hashtags at the end of a post. Not due to how Lemmy sends it.