Woohoo

Does trying Hazbin Hotel and its spinoff to try to fit in on MLPF count? 

I wouldn't do that with a full series, most shows I don't like aren't interesting enough to even make fun of.

The most episodes I've seen of a cartoon I didn't like was probably Crazylegs Crane. I only watched it because I had seen all the other DePatie-Freleng shorts, and I could say I kind of liked maybe one or two of the 16 shorts. It had one of the most annoying characters I've seen in any cartoon (a dragonfly singing nonsensical songs that weren't even the funny kind of nonsensical, with a nails-on-chalkboard voice). I found the whole thing just sad, considering the talent involved and how none of it showed.

Watching the first three episodes of Season 9 felt like hate-watching. Thankfully I stopped.