People are asking me too, and I've been pretty lucky that everyone has said its nice to have the surprise. I think it's just people being interested. Although it does sound like your colleague really struggles with not knowing for herself and obviously needs that. Reality is that we cannot avoid socialisation... Nor would we really want to all together, it helps children learn appropriate behaviour die different situations. It will be the way you interact with the child that will determine whether they are pushed into gender roles that you are uncomfortable with, not what colour you may or may not paint the room.

I do get why it felt uncomfortable, but try not to get stuck on it. They are entitled to feel that way too.