I have never seen people "RP" in dungeons before unless they were a full premade group for an in-character run. The common mentality I've seen the thousands of RPers I've interacted with has been "don't do IC runs when you PUG or DF or RF content. And if you plan to do an IC run coordinated on PF, put that in your description or better yet, password lock it." A significant portion of RPers are already shy or socially awkward. I'd be amazed if they even spoke in a dungeon beyond the standard "hi/hello/hey" during protect casting and "gg/bye/thank" at the end.

Where are you all finding these "ice mages" and whatnot? Since I started this game in 2012 ON the unofficial RP servers even, I've yet to see it. What I think you've found are trolls masquerading as RPers. There's a difference even if they might look the same.