I'm a guy and I've got quite long hair, though not shoulder length.

I like my own hairstyle 'cause it makes me look relaxed and kind of trashy (though I can comb it when Im attending formal happenings and stuff).
I guess I like the freedom of letting my hair grow, and because of a lot of idols of mine have not LONG hair (per se) but rather uncut hair, if you understand the difference.
Short hair is just too simple looking, and is giving in to the system (in some way o_O). I realise that guys not getting their hair cut short has been a trend for some years now, but that's neither the reason for my "haircut", nor does that trend include my hairstyle (not entirely).

I once said to a girl: I'm not gay you know, so you probably think I dress badly.
Her reply: Nah, you dress really good, but you have this nonchalance around you that makes you look like a not-gay person.

I'm not implying that people think of me as a gay-looking person though

The hair fits the person. At least in my case I believe so.