Drinking beer at a frat party and getting blown away is Plaid. Sitting in a ramshackle apartment and getting stoned while listening to Pink Floyd is Woodstock.
I think you are missing the point of this article. Both sides did stuff when they were young. It's what KIND of stuff they did.
There is also the matter of who has grown up, and who has not. I think a higher percentage of Plaids have grown up.
cocaine was a plaid thing? And the examples the author used was plaids who were "square" back in the 60's and are still moral today. He's giving Bush a pass while he rightly comdemns the hippies.