I only watched in social situations, not on my own, and didn't watch any highlights on the official rights holders' YT channel in the US. I know it's hardly a full boycott, and I was generally still aware of what was going on especially towards the end of the tournament, but it was my feeble attempt to minimize my contribution to the whole thing.
I don't think watching makes anyone a bad person, not watching doesn't make me a better person, but at least I think I'm consistent in rejecting Qatar's attempts to buy attention and influence then, just as I am now.