It's not uncommon for someone to go "my friend just figured out some gender stuff and now they're exactly what I'd like to be... Oooh ahh gender thoughts!"
On the flip side, I remember being like 8ish and my friend told me that I shouldn't say "cheers" to say thank you, because that's what boys say (indeed, I had picked it up from my brother and dad). Instead, I should say "ta" (or just "thanks"). That is so incredibly gender, I can scarcely believe it happened.