I noticed behavior that broke a community rule ("Don't mass downvote a user's comments to harass them") and I'm unsure of how to adequately report this. Since I did not want to bother the forums, I checked its help page:
If you believe that a forum post either contains spam or breaks the Community Guidelines, you can report it to the Moderators. To report a forum post, click on Report at the bottom of each forum post. Please enter a valid reason.
Since I'm not reporting a forum post, the only alternative given here is to message a Moderator, but I'm unsure as to whether or not that's something users should do for minor issues such as these. Apologies if I overlooked relevant information.