I don't agree with why they were kicked, but the group had a right to do so. A "difference in playstyles" is a legitimate reason and that's exactly what it was. I probably wouldn't have initiated the kick myself or even clicked yes though because it seems rather petty. Now if they were pulling slow and not tanking what they were pulling? I wouldn't have hesitated and would have had no regrets. But if someone is doing their job at least mostly correctly then I just suck it up and think "well, this is what I signed up for" because the DF is a mixed bag.