Well, when people's comments need the f-word in nearly every sentence used I guess we got people in need to face the wrath of a moderator, as that's not the way to hold a discussion. I'll admit my own language ain't so clean, either, but remember you are on a public forum here, and I won't fall over a few f-words, but when it gets in an overload you're not making a point, but only embarrassing yourself.
As for this thread. I've been on a music site myself as a reviewer, were I met somebody who was just as much ranting about low ratings as you are now, and I tell ya what, from one of the most popular users he pretty soon became one of the least popular. Of course, I found him ranting over a negative review "If a song is not your style don't review it please" (when the song was in fact beyond terrible and the artist themselves even acknowledged that) while the review could describe in pretty much detail what was wrong about it, and that made it all even more embarrassing.
"but this is internet buddy, the place where you can't punch people for making such comments"
Well I've punched people in the face for such comments on the school yard, when I was still a boy, and got myself in detention for it and the bully in question only laughing his ass off, taking it as an encouragement to come up with even worse comments reminding me that if I'd respond I'd get myself in detention again. In other words, this does not only go this way on the internet. People just are plain mean.
Now when it comes to just getting comments as "F--- OFF" for a comment on your game, just report it to a moderator. Most sites forbid that practice, and on most sites moderators will delete such messages and if people really turn it into a sport remove them. That is what moderators are for, but moderators are in the end only human, they cannot see everything people post on all pages of this site, since there are simply too many. But I do believe itch.io has, like any DECENT community site a report button so you can help the moderators take care of your trouble. And moderators normally also have the power to ban people who turn this into a sport.
Posting on the forums about such abusers is mostly not gonna help. As a matter of fact, then you give them what they want... A stage on which they see they got you frustrated... Don't give them that pleasure.