Repository owners, collaborators, and prior contributors to a public repository can now more easily report comments, issues, pull requests, and commit comments to GitHub Support.
Selecting the icon above will open a new contact form where you can provide more information and additional screenshots. You can also let us know whether it’s a spammy, harmful, or off-topic comment.
Comment authors also have the ability to report their own comments if another person has edited their comment in an abusive manner.
Check out the documentation to learn more about reporting comments.