Yes, it's a shock isn't it ! Bet you never thought or acted that way ! Boys grow up. If they only know one way, one culture,the one that surrounds them, that's the way they'll have eventually, after a bit of teenage rebellion against it, or some of it.If, however, they see other ways, they might grow up to prefer those, without harm. This boy may think he has good reason for not talking to his mother or family but, when older, come to think otherwise.Must say that refusing to do something 'related to culture' cannot, of itself, be automatically bad. Plenty of fine people did that in their past. Some understand too that 'tradition' is the 'democracy of the dead', doing or thinking something only because our ancestors did it or thought it..
What is having a 'culture' here ? It certainly shouldn't be slavishly following the edicts, traditions and ways of any group, his mother's or anyone else's, simply because they have always done so.