Unless you have that very specific fetish, I would say most people would find drinking human milk as adults pretty weird. You could think of it like that.
Yes, but it's not a direct comparison. 1 you don't find it available for comsumption anyway, even if you wanted. 2 culture didn't develop to normalize that but it could. For example there are cultures in which it's normal to eat frogs or insects while others aren't. 3 Asterion isn't quite a cow. 4 I was looking for Asterion's personal reason to avoid it. The difference here is that I'm not disputing his right to avoid it, just wanting to understand him better, and a general motive that could work as an explanation doesn't really answer what his point of view is here.