Doonesbury by Garry Trudeau for February 14, 1976
Transcript:
Clyde: Hey, Ginny - what's wrong with Blondie? She looks pretty messed up over somethin'! Ginny: She's upset about Andy, Clyde. It looks like things aren't going to work out for them... Clyde: Oh, yeah? What went down? Ginny: It's a little personal, Clyde. Joanie will tell you if she wants to... Clyde: She don't have to - I already know. Blondie's finally admittin' she's one of them chicks who don't like men. Ginny: Oh, Clyde... Clyde: I'm tellin' you, Ginny, that's what this lib stuff leads to!
Sadly an erroneous assumption that is still alive and kicking…