It’s probably just the timeframe I’m looking at, but it seems like 20th century cartoonists enjoyed poking fun at swing jive enthusiasts and beatniks way more than they did hippies or punk rockers. I don’t have any particular theory about why that is. Do you?
Fancy Notions 
I always thought it might have had something to do with the ‘switching of the guard”, though Mad Magazine (still largely stocked with artists from the 1950s) carried on that tradition.
Interesting. Someone on FB opined that the artists might have felt more of a kinship with the beatniks, or at least enjoyed their colorful lingo? And hippies and punks were scarier or more foreign to the artists’ sensibilities?
I’d go with that one!