I can understand the feeling a lot of pro-whitelisters but I feel like whitelists, splitting the server etc is totally the wrong way to go about it. I strongly believe that if you want to raise the quality of RP on the server the best way of going about it is to lead by example. That is, creating fun, engaging RPs and getting both old and new players involved.
For example, when I first joined the server I had never played on an RP server before, I was a very casual RPer and pretty cancerous too at times. It wasn't till I met people who had really interesting RPs, who engaged with me even though I was new that I started to realise the cool things you can do with RP and I think I became a better player because of it.
It's not easy but I feel like that's the kind of thing you need to do if you want to raise the standard of RP on the server, rather than closing the door to the "other" players, perhaps something we should push as a community instead?