You're a shade senior to me in terms of age and I'm also a Yankee but I was raised similarly along those lines only to different degrees. I remember by Grandfather teaching me that a man who wants to show himself as a gentleman and court the respect that entails always removes his cover when in most indoor settings. There are some exceptions, such as particularly large buildings, such as the Astrodome, lol, Grampa probably wouldn't have taken his hat off either I don't think. Also I always understood official capacity a little looser than you've outlined. I'm a member of a pipe band and it's usually customary to keep headgear on while playing indoors. I was also taught about hat tipping and what have you but honestly women my age give me a real hard time about it and it actually almost seems to offend in some way and since tipping your hat is supposed to avoid that, in my case it seems pretty much counterproductive. I was also taught to rise at a table when a lady enters the room, I can't help myself from doing that one and I get laughed at for that one too.

It seems like even that level of formality or manners most people find quaint and outdated which is sad to me because it always struck me as just a nice way to be, a respectful way to be. Many think it's oppressive in some way and I can see how one might take it that way but if you understand what it's SUPPOSED to communicate how could it be oppressive to show your respect for someone?

I've found people in the south still stick with these social codes but it's even dying down there. Up north is a totally different story, I feel like a social outcast for even thinking about wanting to mind my more traditional manners.