Why are people like this...?

Your friends seem ignorant. Just because it's their job doesn't mean they like it. Maybe it's the only job they could get. Anything I can do to not make a mess that people will have to clean up I do. I hate when people have a lack of respect for people just because their job isn't "glamorous." Without janitors everything would be dirty.

I think that's their job to clean up after guests, but there are certain points that are really crossing the line, like ordering a maid to clean clothes or go to a store to pick something up. they're maids, they serve guests, they're not servants

I feel the same way you do. I try to clean my mess in public and whenever I see them cleaning I try to avoid the area.