i don't quite agree with this. for a number of reasons.
But, how I usually go about this is, is try to aggrovate them a little bit(it's usually very easy) and a majority of them attack you. You can tell that they are pretty bad at role play fighting, so what you can do is tell them tips to become better.
this being one of the reasons. its not good to go /trying/ to piss people off. i don't at all think there should be a group of vigilantes crusading around the plains to purge the newer players of their lack of skills. i think that having some of the groups for lower levels is better. it gets them into the basics, and while the ones higher may frown down upon these, they're not gonna know any better.
instead of just randomly finding these groups, it would perhaps be better to set in with them, instead of shoving your opinions on roleplay onto them through preaching and putting them down on their own abilities.
as for the mate beggars. telling them off isn't the way to go about that either. the way i see it, it's no different than any other advertisement in general. let it be. and if they get to the point of being bothersome. block them. but don't go stirring up the pot.