I know I'm not crazy but a 8 1/2 year old should know the difference between clean clothes and dirty…

I know I'm not crazy but a 8 1/2 year old should know the difference between clean clothes and dirty right? my son throws his dirty in with his ran so j told him to go separate ky and all the clothes are now so he says dirty and he smelled them...thing is I know what's clean what not because he hasn't worn the stuff he says is dirty ...annoying may be dumb but he's grounded till he figure that out my kids just don't know how to be cleanly even if you show them ....