Originally Posted by Slims

How is it rude or any different from any other tool?

I won't knowingly carry a weapon into the residence of someone whom I feel would not approve. But it's along the same lines of wearing a leather belt into the home of a Vegan: If you have reason to believe they would be concerned then act appropriately, otherwise it is a non-issue unless they bring it up.

There is nothing 'rude' about carrying a firearm into a home unless you believe that you are incapable of safely carrying the firearm or that firearms are inherently evil. Unless either of these statements is true then you are doing nothing wrong or intrusive.

The law allows for any concerned home owner to post a no-weapons sign which legally binds visitors to not carry weapons on posted properties.

There is no etiquette difference between carrying a pistol into a supermarket and carrying in a house without asking permission. Both are private property.