I listened to a fair bit of comedy stations while touring the USA, and a lot of stand up seems to be super focused on sex, drugs, fart jokes and race to the point it gets tiring to listen to very quickly - most of it has no comedic value and is just the novelty of someone talking dirt.
Then whatever you were listening to is not even a quarter of the good comedians in our country. If it was FM radio, well that's your problem, honestly. Sirius XM is the only way to go if you want good comedy shows.
It was Sirius, with the four or five different stations.
My issue is probably more to do with a lot of American stand up being junk.
Don't get me wrong, about 25 percent of the comedians on there are decent. The rest is someone talking about dirty sex like it's some sort of huge novelty, or screaming at the audience about feces. I wish I was exaggerating.
Don't get me wrong, i'll chuckle at the occasional fart joke. But repeating it over and over again as the central plot of your act is tiring and lazy.