I am in gay community for 3 years already and I know some guys with pretty long hair. But most of them have length around mid back. But also I have met 2 guys with really good long manes. I understand why long hair in gay community sadly not popular. It’s because male hair are not that good as female hair. But some guys have very good hair genetics. So one of those long haired guys that I have met was asian decent so he had straight thick black hair till ass and one guy was metal head and has been growing his mane for around 12 years so he had it to ankles.