I think that so far this conversation has been amazingly uncontentious (Sorry, that's probably not a word, but I'm too lazy to look it up). Those of us who are happily childfree have no problem hearing that parents are happy to be parents, and that they don't regret the decision (or lack of). The only time this discussion gets unpleasant (and I've had it dozens of times) is when a parent tries to tell me that I don't know what's good for me, and that I will regret it later, or that I should have kids even if I don't want them, or that I'm selfish.