---The only reason I've let him keep commenting and me comment back.
Is for more evidence
And the fact that he's gone on my profile and tried harassing me. So I'm gonna call that Self Defence.
For now ignore the situation. Spending your time replying is only fueling the situation.
If you continue to respond, you show that irritating you is working and is making you a very fun person to be able to pick on.
I'd suggest avoiding communication with the user. After you have ignored the player for some time and these actions of harassment continue, then some form of action will be taken place.
For now, ignore the user. Give it a weeks time. If they continue, gather some more evidence, especially server wise, and bring it all back to here to make another repeated report.
For now, the images and quotes shown are strictly steam related and it's a report you should make to valve as none of us have the ability to restrict the player. We administrate our community servers, not Valve.
So considering this, there is assumed nothing else to be presented. For now I see this threat solved and finished for now until further notice.