Been noticing Americans not taking their shoes off when entering someone's house.

I do not wear shoes in the house but I have slides that I never wear outside

At my own house its hit or miss, usually I take my shoes off, but sometimes I forget im not a stickler for it. At other peoples house I immediately take my shoes off unless told otherwise.

American here, Yes, I take my shoes off in my house and ask guests to do so if they come inside.
dirty floors are ghetto.

Robot vacuum>

Skynet starter kit.

generally i do but i wouldn't really care. i have a easy to clean floor

Same my floors are that laminate crap thats meant to look like wood. Plus with a 2 year old running around in there i got bigger problems than a little dirt.

Y'all are just trying to hide the holes in your socks.

depends on the house but usually.