Honestly I think this is a situation where you have to decide what works for you and stay in that lane. There are some people who want everything to have order and its place and there are others who walk through life less defined. I don't think there is a right or wrong to it so much as you understanding not everyone will decorate their table in life as you would. The office example really speaks to personal habits and less about personal space. The breakroom is for all employees and chances are that fella has a full sink at his residence before he puts things in the dishwasher. Then again maybe he was busy and that was just a quick detour on his way back to his desk before a meeting. I wouldn't put too much weight on little things people do because you have zero context as to the bigger picture here. I've met people before who appeared very defined one way, who turned out to be the very antithesis of that perception in their personal lives. I think the less you try to fill in the blank spaces and size people up the better you will be. Its like the old saying goes, 'Never judge a book by its cover.'