Considering Vegeta is sort of a gray area after his first fight with Goku, I tried to think of something else but couldn't think of much.
Raditz is an arrogant dick withno redeeming quality.
Nappa is a hotheaded arrogant dick with half as many brain cells as the others.
The Ginyu Force are a bunch of cringey morons and I couldn't wait for their screen time to be over.
Frieza is as unlikeable as it gets. Although I kind of did want Frieza to hurt Goku after his dumb decision to give him energy. I like to see dumb decisions get punished.
Similarly, as much as I like Vegeta, C18 breaking his arm was damn-deserved for him being an arrogant dick and letting them get released.
Also similarly, him taking a dirt nap from Perfect Cell was deserved for letting him absorb C18.
Perfect Cell himself was the embodiment of pretentiousness.
Fat Buu: Annoying
Super Buu: Almost as unlikeable as Frieza
Although I did want him to smash Gotenks and piss on him, just because of how much I hate Gotenks.
Kid Buu: No reason to root for him at any point
So I guess
Frieza vs Goku after getting energy from Goku
C18 vs Vegeta after Vegeta let them out
Perfect Cell vs Vegeta after letting him absorb C18
Buu vs Gotenks