Aside from current contributors not knowing the reason for the hostility, there could be others observing from the sidelines that could decide this board is too closed to bother with.
If a new member has a problematic history in other forums or elsewhere that you are aware of and have concerns about, the right thing to do is notify the moderating team by clicking the report to moderator link in the bottom right corner of the post. Please dont flame or ridicule new members in public.Thank you from your friendly moderating team.