Expressing frustration is fine. The thing I really have a problem with is how misplaced it is in this case. Even if every big pickup truck (and big SUV; why not?) somehow magically transformed into a compact sedan tomorrow, we'd still have the same shitty car-dependency problem we have now. We'd still have the same number of cars demanding the same wide roads and huge parking lots, destroying walkability, making our cities insolvent, fucking up our health*, etc. Nothing would've actually improved in any meaningful way what-so-fucking-ever!
The arrogance of space of all cars is the thing we need to be frustrated about, and the inherent pretense of these anti-truck posts -- that of redirecting criticism of all cars to one particular type of car -- is at best a useless unintentional distraction, or at worst, deliberate disinformation designed to sap attention from efforts towards things like road diets and parking reform.
TL;DR: If you're bitching about specifically big trucks, you're not bitching about cars in general -- and we should be bitching about cars in general!
(* That one's a trifecta, BTW: lung disease from pollution, obesity from being sedentary, and poor mental health from road rage and loss of "third places" due to Euclidean zoning!)