Sonikken said:
What if someone harassed/insulted/calling names in a comment, but an admin won't do anything about it because the comment was 2 months old? What can you do?

I tried reporting someone who had done that, and the admin won't do anything about because, in his words 'I'm not going to do anything about a comment that's two months old unless it links to illegal content or malware.'

I don't recall seeing that part in the Harassment rules section.

If someone was mean to me in elementary school, I cannot just go and punch them in the face in the middle of the street today.

You can simply communicate with user in question or simply report them again if it continues.