I'm fairly certain that my own mother thinks much the same about me. She doesn't put it into so many words. She prefers to moan about my maiden aunt, who has almost no social life at all to speak of (and, to be honest, is genuinely lonely and unhappy). Then shortly afterwards she will tell me how much like said aunt I am!
Ffs, I'm married, have grown-up children living nearby and little grandchildren who I look after several times a week, so plenty of outings for family reasons alone - in what way does that make me like my auntie?
True, compared with my mother's, my social life is very limited, but it suits me - I genuinely don't want to go out any more often than I do now!
Therein, I think, lies the crux of the matter: my mother (and father), in their eighties, have always led very active social lives, and over the years I've come to realize that my mum, much as I love her, really doesn't understand (or consider 'normal' anyone who leads a different lifestyle from hers.
"Vive la difference", I say!