Hazbin Hotel and Helluva Boss aren't funny and are mostly immature "ha ha, people have sex and say cuss words and do bad things!!! funny!!!" type cringe humor.
Both series mostly serve as Rule34 material, and that's clear from character designs.
So this is... not surprising.
Also, it kills me to have this opinion on these shows because the character design is good (despite being cheesecakey), and the animation is often top notch. Too bad I can't stand the fucking writing.