The same goes for a messy house. It may be a matter of subjective preference, but it's a subjective preference that a lot of people share.

Apparently one my roommates and landlady all shared and I didn't. I like clean countertops and clean dishes and I would not like pill-bugs in my room (I almost always did my dishes and I don't leave food or dishes in my room for more than 24 hours) but papers on the desk and clothes on the floor don't bother me at all...in fact, I think I find them vaguely comforting. Messy is not necessarily the same thing as dirty. I think most people don't like dirty, but some people are more okay with messy.

If someone prefers a messy house to the labor of cleaning it up, they may inadvertently send the signal that they do not care about the aesthetic preferences of others, just as they would if they preferred not showering to the annoyance of showering.

If their friends who they have over have higher cleanliness standards, then maybe. Otherwise...most of my friends live in messier houses than I do, and it doesn't bother me at all. Maybe we'll get tidier as we get older and fussier.