People wanting to be the next "legend of the liar" are really starting to get on my nerves

Has anybody else run into this a lot recently? It might just be bad luck but I'm getting sick of people pretending to resign or pretending they meant to go random or otherwise don't know how to play their civ because they accidentally picked the wrong one. It doesn't work, I play the game out as normal and I don't stop attacking until one of us loses or resigns, but I'm annoyed because I think it's bad for the community as a whole. People are taking advantage of the fact that this game has a very accommodating playerbase, and I'm worried that if this type of thing proliferates around that's going to change. How can we shut down the spread of this? Do we just ignore them collectively until they stop? Should I just report them as griefers? It seems a little extreme to try to get someone banned over saying "gg" and then not resigning to try to trick their opponent into relaxing. Then again, it would be a huge loss for a nicer (if gullible) player to quit over it, though I still won't be hitting the report button yet unless I start seeing it in basically every game. Any thoughts? Is it all fair in love and war?