Yeah, we get a lot of that around here. Oh you could report him (and should if he used really bad language), but it's easier just to block him and move on. To block: Run your cursor up to Home in the upper right. Click on Account>Privacy. The bottom of the page has the block settings.
A player just exploded on chat after I refused a draw, calling me a cheater and threatening to have me expelled. How does one deal with this? He thinks I have an engine.