I would hate someone "dropping" in to see me, but then I do have both physical and mental health problems. But, yes, I am from the South, and when my mum in the 1960's had a friend come around, or she visited a friend (with me in tow) they they would have already arranged the visit by telephone.
So in my younger adult years I would have thought someone was quite rude to not have checked if it was convenient first. At anytime throughout my adult life I would have, and still would, consider someone wanting to visit for even 10 minutes on a weekend, and therefore a 'family day', very rude indeed. At a weekend I wouldn't even want a phone call suggesting it, as I would not like to have to say no.
I know I sound very grumpy, and as if I don't deserve any friends (I probably don't), but the only counter argument I can give, is that if, however, a friend has any kind of an emergency, they know they can ring me anytime, day or night, and that I will do whatever I can to help, even if that means my husband and I driving several hours to get to them to eg help look after their children, or to collect their dog and bring it back to our house, if say, they had to go into hospital, or just to hold their hand, make them cups of tea, encourage them to eat etc.
So, sorry OP I do think you were being unreasonable in two ways, firstly because you didn't even text first to see if it was convenient for them, and secondly for being upset that they have asked you not to do that again. It can't have been easy for your friend to give you that message, but if her home is her safe sanctuary you should feel pleased that she felt she could tell you, and thatshe doesn't just hide like I do whenever anyone comes knocking unexpectedly!