I am hetersexual, have been married for 20 years and have two children. Should the unthinkable have happened and my children were placed for adoption, my hope would be that they would find a loving, safe home. I don't care at all whether or not that home includes a single parent, two same sex parents, or even parents of a different ethnic group. What I DO care about is that they would be loved and safe. Focus on that and ignore everything else.
Discimination hurts society. Hands down.