Wait, so he's a lesbian too?!
Nah, can safely say he's a dude.
That's just her cover man, in real life she's a very positive happy Korean girl. She just posts as Derrick, a negative persona to let out all the negativity built up inside of her, so she can continue to be really positive in her real life.
Actually in the real world Derrick is a minor celebrity, here's a GIF I found of her. (I probably shouldn't be revealing so much)
