Agree with Tangerine, Chev and LOVE *lilka's comments.
I must be seen as a heartless bitch as have never got a "well done"! Although I had had 'you are doing something wonderful.' similar to the 'You are doing an amazing thing' ...
I am happy with that! I am. And so is DH and DD, and so if my son ds who is adopted, he is doing his bit accepting us as parents. So I just summerise by saying "He is wonderful, we are the lucky ones."
It is normally well intentioned (in my experience, in my life).
And no one has said "I couldn't love someone else's child/a child that isn't my own." And if they did I would just say, he is my own!
And actually, I love my dd, who is a birth child, but if I suddenly found out about 'a switched at birth situation', I know I would not love her any less! I have had 10 years to get to know and love my dd, so for me it is not about being genetically related but about time together, and every day with dd and ds there is more time with them to love them more. My favourite song for dd was that 'every day I love you a little bit more' song.
As others have said, love is not about being related to people.