I don't see why you have to comment on what others watch. If you don't like it, then leave those that do be. There was no reason for you to go out of your way to click on this episode just to shit on it.
And for reference, 6.7 is far from low on mal, it's barely below average. If you're gonna do shit like coming to an episode just to shit on the anime, at least do it for one that's under 5.