When I used to teach drums, "Lefties" always wanted to play in reverse... but I taught them right handed. They complained that it didn't feel right, yet they always moved along at the same pace as the other beginners.
I'm glad my teacher taught me to play what I naturally am- left handed. He was right handed himself, so he enjoyed the challenge. There is no right or wrong way to playing the kit in terms of whether you play left or right handed set up, so why should 'lefties' have to learn right handed? You wouldn't like it if someone said you had to play left handed, regardless of whether you are right handed or not.
And anyway, us lefties have be persecuted for long enough! If it's not for being a witch, it's for playing the drum kit in reverse! lol