I don't think you offended anyone. I am glad to know that you were being humorous, but even if you weren't, everyone is entitled to their own feelings and opinions.
I bet you won't be as tied down to the house as you think you might. It's amazing the things they have now days to be able to accomdate everyone's hobbies and still have children. Who knows what neat new thing they might have by the time you have a child.

I do get your humor now that I know you were being that way. I call mine a brat all the time and he knows I say it with all the love in my heart. I never say it except in humor. Guess that makes the difference. Hope I haven't scarred him for life.