As a rule, at my home, you are asked to remove your outdoor shoes as you come in. Many others have this rule too, and many do not.
Regardless of whether you agree with this rule or not, the rule or not is the homeowner’s decision and of the people that live in that home.
So when you know this, but blatantly disregard this when entering, how should this be dealt with?
My manner in the past has been to ask politely once, ask harder the second time and then force the issue or kick the person out. Some people have a genuine reason, i.e. those that have a disability in some way that means it is very difficult for them to bend over to remove shoes, etc. But for the rest, the choice is simple: follow suit or don’t turn up until you are prepared to.