Emerging from the dirt to give my two cents:
Demolition Doofus is, admittedly, not an episode I can really bring myself to hate anymore. For Season 8 standards, I'd almost even consider it good. It's not exactly the most compelling story out there, mind you, but for what it's worth I'd watch it over half of the garbage in this season. Mrs. Puff having an actual, justifiable reason to hate Spongebob's guts was something I appreciated on my latest watch through, when before I'd have probably detracted it for the same reason. Plus, I felt the pacing was better here than in other episodes this season which moved slower than molasses, and the comedy was decent enough. I still wouldn't call it one of the greats though.
Trenchbillies, on the other hand, I cannot extend the same praises to. There's little to this episode outside of it being gross and sloggishly-paced. I think this one almost made my list, but I discounted it since the other episodes I listed were worse. Definitely not an episode I'd want to return to.
A SquarePants Family Vacation earned my top spot, and I'm disappointed to see it so low lol. I really don't care for this cartoon in the same way I used to, so I can't say I feel too strongly about most of the episodes that show up here or later on the list. However, this episode was easily the most dreadful to sit through; there's nothing to write home about with it, the writing is pure garbage, there's clearly not enough content to warrant 22 minutes of this slop, and Jesus Christ will you please stop singing that god-awful song. The, as one specific Spongebob reviewer who I don't feel like naming right now said, "calm and relaxing atmosphere" does not hold my attention. Good sleep aid, I guess.
And as for Slide Whistle Stooges, I found this one mildly annoying but not outright awful. There's not much I can actually say about this one, because most of it is just Spongebob and Patrick chasing Squidward around with slide whistles. Really not much you could write about that, I'd reckon. Skippable episode, but nowhere near the bottom of the barrel in my opinion. Also the "baby assaulter" scene was absolutely out of pocket, it gets a laugh out of me when little else in this episode does. That's about all I can say I enjoy about this one though.