Hmm not really... I don't expect people to agree with my opinion on things. Though I suppose I can kind of liken it to speaking to people uneducated about say, homebirth, and spouting off about how dangerous & irresponsible it is. So yep, I can definitely see why you are frustrated with it.
I don't know why people (IRL that is) feel such a need to be so vocal about such a personal decision... I guess if they feel it is actually dangerous, they may be worried about other people's kids - but they need to be open to discussion on such a "hot" topic! Otherwise I just wouldn't bother talking about any subject, really, if you're not respected & heard.