Speaking for myself, it's not the loss, for which the score was not really a "blow out." It's the way in which we played on offense. Again, this may be more than a bit of PTSD from a decade or more of being punching in the ding-ding over and over again.
When I rewatched the game and was disturbed by the inability of our OL to block even just one-on-one consistently in either the run or pass: the pressure on SS was almost always caused by 4 rushers against our 5 OL (and RB) or a simple OLB/S/NB overload where a TE would normally be; the utter lack of any sort of combination of power/misdirection in a "running game" was fatally limited; running a scheme of 5 OL with 4 WR almost exclusively without material changes in formation, motion, or shifts; just line up in our standard run-and-shoot formation, give the defense as much time as they want to match up to the same things we've been doing, and then--invariably--throw a pass. There's no group of players that can be successful at a competitive level doing that.
For us to do THAT--to try to use that scheme--after a year of planning and scheming is scary to me.
I don't mind losing a tough game. I thought it would be very hard to go 3-0 to start. However, I do mind not even appearing to understand how the game is played. Our offense was so far from "dominating," in scheme as much as in play, as to be absurd. I actually think our defense was pretty good. They allowed only 14 points (beyond that strange INT/TD play late in the 2nd). But even 21 points against our defense should win on any day.
I do love the use of the word "whinging," though. Appropriate and expressive. Yes. I have hard-core PTSD, and I'm wrapping my arms around it until I see something to alleviate my concerns.