Click on the timestamp of the comment and you should get a flag button on the page for that specific comment. If you have enough karma for flagging. I suspect adding the extra click reduces excessive flagging behavior.
Note that the best way to address a perceived problem with moderation or lack thereof is to email the mods. Because while it might take a couple days, you'll get an answer which feels a lot less like screaming into the void than hitting flag buttons, and the mods will also know why you're reporting something because you can explain it.
Note that the best way to address a perceived problem with moderation or lack thereof is to email the mods. Because while it might take a couple days, you'll get an answer which feels a lot less like screaming into the void than hitting flag buttons, and the mods will also know why you're reporting something because you can explain it.