What is the obsession with 'Brony' or rather, 'My Little Pony' among some guys...?

[bethany]

I don't know if this is only happening where I live...
But I know quite a few guys who are OBSESSED with it.
Why?
It's girly. Some of these guys who are obsessed with it don't seem girly in the slightest.
It's really creepy (in my opinion). I find the ponies a bit weird.
My friend drew his brother a card and drew a pink pony in it...
I don't care if you think "boys can like pink too etc etc"... that's not really my point.

Will someone explain what is going on here. I'm really concerned.
Especially as I like a guy who is into all this stuff. I think it's kind of unhealthy, they have twitter accounts for thier ponies and everything.

Most guys I know aren't like this btw.
The world has gone mad, and... crazy.
HELP ME UNDERSTAND/Give me your opinions.
Thanks!
p.s. what does 'Brony' stand for?