What do you think I should make of this? I sent an email, and he responded with  "Thank you, Sir I recieved it!"

like lmao, i sent this professional little email with an essay and i get that back. *misspelling too in his spelling*
I picked up gay vibes him though.... so he must be, gay???

i am picking gay vibes on a lot of people lately...

tell him not to call you sir. if you're presenting yourself as female, he shouldn't do that. i don't see how he could be gay, but it doesn't really matter. he should call you the gender pronouns that you identify with.