The indoors thing seems goyish to me. They actually think it's more respectful to remove a hat indoors.
You should not call the greatest poskim "goyish." That's a disgrace. It's embarrassing that you said something like that.
As for the psak in question, No one ever said "take off the kippa when you get indoors" or "lack of head covering is respectful." They said that you don't need to wear it because the ceiling qualifies as a head covering when you are indoors. How did you connect to completely unrelated things? Shall I say it's "goyish" to misunderstand Jewish law?
The psak is certainly not telling someone who wears a kippa to stop doing so indoors. That is not the point. The point is, halachically, do I need one on my head at all times or not? What if I don't have one right now? Ceiling qualifies. Period.
As for your claim about gentiles, we don't live in the 1950's anymore. When's the last time you saw a gentile habitually wear a hat outside in all his travels and then promptly remove it after stepping in doors out of "respect?" LOL maybe in a Carey Grant film.