Humor, like much in life, is subjective, yet you can step outside of that to an extent and marvel at the viewpoint someone takes, their artful delivery, or some rare talent such as speed (of speaking, not the drug), quick wit, ability to connect disparate thoughts in rambling conjecture, impressions, and so on.
Not many comedians make me laugh, especially in stand-up format, but I can still acknowledge certain talents.
For me, the best in comedy, take their own path. They might borrow from their predecessors, intentionally or not, but they are creating their own thing.
That is why you get a lot of criticism of comics being either derivative or copycat (like many of those who do political satire). It's hard to take something and make it your own. Jon Stewart didn't create political satire, he popularized it in a different way that seems to get copied a lot.
Comedy is hard. But sometimes it's more valuable to move along and find a comic you like rather than bemoaning one you find intolerable. Open mic nights tend to be cheap or free depending on your location. You might see something you like. You will certainly see things you don't. You will see that comics are much harsher to one another than the casual observer could ever hope to be.