Kind of make sense because there were always two kinds of hippies - the peace love and drugs hippies, and the nasty spitting political hippies, which were really more like Yippies back in the day. Seems to me they came up with Yippies because they didn’t want to be associated with the hippies, which were probably more an outgrowth of the beatniks.
Too bad Bill Ayers didn’t tune in, turn on, and drop out.