Simple comment bookmarking!
In the lower-right corner of each comment, you'll see a pushpin icon. If you click it, the browser will silently set a cookie remembering your place. Next time you visit that page of comments, look for the corresponding pushpin right at the top of the Comments section. Click it, and you'll scroll right down to the comment you previously marked (if it's on the present page).
That should allow you to pay attention to more weighty matters, such as correcting whoever's wrong on the internet!