That's the nature of the internet. By posting your comments, pictures, thoughts in this public area, you expose them to be praised, challenged, ignored, or sometimes criticized, ridiculed, or insulted. There's no such thing as a right to not be offended and unless these comments turn to harassment or threats, there's nothing illegal going on. You may not like it, and so don't read it.

To be surprised that adults act this way is to be very, very naive.

This sub (here) is /r/makeupaddiction and they enforce the rules for this sub. It is not their job to do anything about other subs being big meanies, but to keep things nice here. I guess they succeeded as they apparently drove these kind of bully discussions away to another sub.

Your post is titled "Bullying on MUA" but it should be "Bullying on MUACJ" and MUA has little to nothing to do with that.

So instead of bringing here the topic of these people having their highschool fun in another subreddit and posting something not related to makeup thus breaking rule #8, how about we just thank our admins and go back to talking about what we love?

If you really want to address the problem you see with circlejerk, I think it would be better to bring your concerns to them directly. Good luck with that though.

EDIT: frankly I don't get what the problem is. When I look for new post on their /r/, the newest one that shows up was made 13 days ago. Maybe it's because my account is set to SFW, but they don't seem very active anyway. Let them sleep!