I mean, "different playstyles" is so incredibly vague it could be used to justify virtually anything. Having said that, I don't think anyone should be kicked unless they're AFK or DC'd for an excessive period of time, harassing one or more group members in some fashion, or doing something so poorly that it's actually preventing successful completion of the content. Part of the draw of this game for a lot of people is the relatively friendly and positive community, and it takes all of us to keep it that way.