You have the option to flag - everyone with > 30 karma does.

The site guidelines contain a straightforward way to contact us.

Even if the above sentences weren't true, it's still not ok to break the site guidelines yourself, regardless of what someone else has posted—so please don't do that.

Click the time on the comment (e.g. "2 hours ago") to go to the comment view. There is a "flag" link above the comment now.

Thank you. There wasn't when I clicked.