I started wearing a hat pretty regularly, probably 5 years or so ago... I till take it off if I go into a restaurant or especially my church or someone's house but not in what I consider a public building like a store. I have to admit that when I'm sitting at home or somewhere private and anther person comes in the room, especially a woman, there is still a deep buried instinct to stand up. Sometimes I still do if it is a woman older than me. As for the not taking your hat off inside if you are armed... maybe that is why in a lot of older movies they guys still have their hats on... like Humphrey in the movie the Maltese Falcon?