Guys in the US, do you wear shoes in your own home and are they the same shoes you walk in on from being outside? My impression is that this is common? Here in Sweden this is very uncommon. Some do have home shoes or slippers but no one walks in with his outside shoes. Some insist on removing the shoes outside the door. In the gyms you are always supposed to change to gym shoes, there's a "shoe line" lol, but I confess I slip in without doing so most of the time unless it's wet outside etc.
A while back my friend complained his new gf made him wear slippers inside and take them off when going to the bathroom so as not to transfer germs.
After covid most gyms got very anal about always wiping down equipment with alcohol spray, even dumbell handles.