are all 7 year olds GROSS

today after my oldest son got on the bus, i brought down my toddlers potty seat to the downstairs bathroom, and noticed for the third time that my 7 year old did not wipe his butt after he pooped. obviously since i found the mess did not flush the toilet either. or washed his hands i'm sure. i have lectured him about this already. uggh it grosses me out. how can he walk around at school all day with a dirty butt hole. he is probably going to be scratching himself all day. am i ever going to have a mouthful to say to him when he gets off that bus this afternoon.