first come to then ride as they wish...I'm not so sure I subscribe to that plummet.
I tend to weigh up whose around, what board or sized kite given the wind and swell And work around that.
I also admit if I see a really good SB rider smashing some sets I've been known to give up a better wave because ...well I enjoy watching excellent riders do excellent things. There is always another wave behind it I can boost off or tin lid ride it in on my TT.
even if there is the lonely windsurfer in the lineup I also tend to let them take a wave (again if they are competant) because..well I honestly feel sorry for the kilometre tack they just had to perform. be honest I do like watching a really good windsurfer on a big wave, hey have a connection to the wave I still think we don't.
So my criteria it seems is ability, a bit elitist I suppose...probably wrong of me.
What I dont stand for is kooks being in positions they shouldn't be in and worse, the slightly advanced kook who thinks they now have it all Sussed and can do as they please. of course there is the occasional advanced rider who can be an assehole, but we hunt in packs and quickly sort those lot out down here...

But this is really rare, most advanced riders I know are the least disruptive and the most pleasant to ride with...
cause they get it!!!
ps I tend to be more tolerant of chick kiters, and very tolerant of young teenage riders (groms) as well. So I am elitist, ageist and sexist I suppose.