The story behind this windshield note goes like this: the OP’s mother parked over the line. That’s all you really need to know to understand the inspiration behind this note. Anyway, what makes it so funny is that the author assumed the driver of the car was a man, which was why they suggested that they would “never get it in,” to use their words.
Well, guess what? Women can be bad parkers, too, y’know. We hate it when people assume that it’s only guys who park over the line, when, in fact, we’re all equally bad parkers. Gender knows no limitations to bad parking practices.