Hey, the first sign mocks stoners so its okay in my book. He used fabric panels rather than painting or permanently marring the sign.
At first glance, yes, but when he changed it to "Oil war," for Desert Storm, he made it obvious that he was a stupid little hippie brat. Even if he was intelligent and well informed, stupid remarks like that, in that context, make me believe that he was sitting near the sign and getting high when the sun came up.