This is so much more realistic for the boy-becoming-a-man who has been isolated all his life - by the Dursleys, by his fame, by pressing circumstance (Horcrux hunt with only 2 companions, anyone?). Since when did he have a chance to learn about the nicer things in life?
Lovely Severus, paying attention and correctly identifying the problem :)
*Hugs writer* thank you for a lovely start to my day.