I support the flagging, and what @nat-418 says here.
Personally, I have been trying an alternative to peer flagging, where I instead respond and try to offer alternatives to what the person is doing that could be more constructive, and explain why the comment they left might end up being a problem.
However, not everyone has the time to do this. And within the last 2 months sometimes the pace of contentious comments blew up to the point that no one could moderate them.
See also
And the responses to my inquiry on it here Moderation actions need to be transparent on discourse - #18 by samrose