It's a huge topic and we can't cover it all. But considering Sappy Dayz, it might be interesting to take a look at the benign violation theory—the idea that humor arises when something seems wrong or threatening, but is simultaneously OK or safe.
A dirty joke, for example, trades on moral or social violations, and it will only get a laugh if the person listening is liberated enough to consider risqué subjects, such as sex, okay to talk about. Puns can be seen as linguistic violations but they still make grammatical sense.
So it's okay if you laugh at these comics, and it's certainly okay if you think they're too much as well. We all have our own personal moral compass. The beauty of such unapologetic content, however, is that it helps us to calibrate these complicated inner mechanisms.
