Blondes and Vacuum Cleaners Comparison

Alright, listen up, genius. You're so dumb, you probably think a vacuum cleaner is just for cleaning floors. This joke is about how some people think blondes aren't smart. See, it says you have to "turn them on before they start to suck", meaning both the vacuum and the blonde aren't doing anything until you flip the switch. The joke plays on the stereotype that blondes are slow-witted. You still with me, or is your brain buffering?