I fully believe that "the roleplayers" can ease off the rudeness and self-superiority, and that the "powerlevelers" can play in character without being rude.
I also believe that.
I often feel that there is a confusion between RP and IC in these debates.
Calling myself a RPer, all I ask from others is to not ruin my
immersion. This is possibly why I favor casual RPs, not planned (/tell-ed) ones. And I find the game achieving that pretty well, keeping in mind that it is always improvable but not perfectible.
As to judge if things are in-settings or not, it's not our place to do so, out of the obvious vampire or dragon cases. Out of the many reasons for that, I'd just pick the fact that in the current, under construction, limited shape of the environment, imagination is a must, if only to fill in what makes sense. As an example, I'd raise an interrogative brow to anyone telling me that I play my glassblower out of setting. Of course I do. I'll stop making up excuses for not crafting when the industry will be there. In the mean time, I make up, keeping the immersion, instead of being OOC with a /tell [but the skill is not implemented yet].
Bad behaviour is not (directly) about RP. It's about players, game balance, fairness, etc. And actually, in the recent posts, It feels like it is not about RP vs PL anymore; it sounds more like about good RP vs bad RP. Seems to me that there is a contingent of new RP enthusiasts somewhere, only a bit rough and loud. Show them something more polished (one by one, most likely), and you may all get fun in the end.