Suggestion - Ability to Block Users

I think the OP is looking for a solution where they can still enjoy SG.com but don't have to deal with trolls, losers, and griefers.

Yeah that would be way too easy to exploit

Unfortunately though, It's the only way I can think of limiting some of the effects of what I mean. For example, in a trade thread. Perhaps limiting that to trades only, not discussions?

In cases like petty trolling, I could understand what you are saying, but I've had some cases of outright libel against me on this site.

In real life, if something was serious enough? I'd report it. It's what I've done here, but that takes time. It's significantly easier to ignore someone in real life if you can just avoid them, than it is on a site where you have a red notification for every message and reply you get.