Piscopo is a symbol of how out of touch with pop culture Trek has always been. Whether its ridiculous depictions of hippies on TOS or the fact that all the culture in TNG onward is classical music and Shakespeare as if nothing happened in nearly 1000 years. Piscopo was considered a major hack at the time. The only worse pick would have been Andrew Clay. It's just a sign of cluelessness from a very stodgy property.
Clay: "There once was a woman from Venus, whose body was shaped like a..."
Data:"I have heard this one."
In Classic Star Trek's defense, 1960s television on the whole was terrible at depicting hippies. Chalk it up to Hays Code censorship and whitewashing that resulted in 1960s TV having as much social development as it did during Lucy. Your average contemporary television hippie was a starving, well groomed actor, dressed in clothes designed by a 40 year old, and speaking "hip" dialogue written by a 57 year old based on what they thought the young people were speaking. And there was the frequent use of terrible, nondescript hippie music also written by a 50-something trying to do what he thought the young people were into. And it all resulted in something very stinted and awkward. The is true from Gilligan's Island to when Joe Friday informed us how the youth generation was responsible for eating babies and inviting international Communism. On the one hand, this was terrible. On the other, it helped dislodge people from how full-of-it TV was. And TOS can't really be blamed for it.