Does your 6 year old hang out with my 6 year old?
Bossy. Check
Messy. Check
Demanding. Check
Hmmm.... sounds familiar.
I wonder if it's the age. He's starting to get more knowledgable and thinks he knows. And he argues until you just want to rip your hair out. "Besides..." is his favorite way to not give up his argument. I keep saying he will be a lawyer or maybe a politician because he always promises, then has a reason why he can't follow through...
And keeping things picked up is a super challenge. But, recently we got new bunkbeds and re-did his room and he's been doing really well for 2 weeks now keeping his toys and clothes and art stuff put away.

But we did remove about 75% of everything. Just took it away. He doesn't even notice it's gone, actually.