That's a favorite self description of many contemporary libs. Clever, too, since it allows them to declare their opponents intolerant, while being intolerant of their opponents. Preserves their feeling of moral superiority, nicely as well, which is of course the attraction to being a liberal.
Also, it was a joke.
I notice that the posters who think the world consists of only two things, that which is "liberal" and that which is not, rarely have a sense of humor.
"Yes I read the 9th [amendment]. It doesn't say **** about abortion." -Jamesrage