Everyone's definition of a "slob" is different. This could be a case of him not putting things away, cleaning up, etc. IMMEDIATELY. Or if things are left out, maybe that's ok with him. It's not always a case of right or wrong, just different definitions of CLEAN. When people live together there will always be things that get on each other's nerves. You need to talk about it and come to an agreement. Stick to the things that bother you the most, and learn to live with the minor slob stuff.
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Now that is just NASTY. Don't mean to offend you but..
That goes for the kids too!!!