I was not the flight, so I can't be definite, but no "hello" or smile is indeed disappointing.
As for chatting, I cannot blame FA not to chat. Just imagine if they begun chatting with the 400 pax ... you would have no service at all ! Therefore, it's up to you to make the first step. They cannot guess who wants to be left alone, and who wants to socialize ...
As for drinks or more of something, in my old recollection of Y, I've never seen a FA grumpy just because you asked. Go fly FlyingBlue and you'll see what a low motivated strongly unionized FA look like : you bow sorry for disturbing their personal chat only to ask for a glass of water ... that's for C. In Y, there are self-serve bars, with no FA to be seen ... So much for socializing.