I truly believe people were not being malicious with their comments and questions; they were just unfamiliar with or uneducated on adoption or how best to congratulate us.
A while ago, I was thinking of adopting a child. When I told a friend, she asked, "But don't you want any of your own?" I was floored. Years later, a co-worker always referred to her friend's kid as "Lisa's adopted baby." That would be like saying, "Lisa's egg donor baby."