I don't think they were rude, and I wouldn't have a probelm with it. And I respect and love my kids VERY much and do treat them as equals, absolutely. But they are not little adults-- they do break things and they can be quite loud! Disruptive and destructive, God bless them! So, that's why I agree with the followign posts:
And again :
They are often decorated with antiques and breakables. They also are not particularly sound-proof, since they are just houses. As much as I love my children, I would not want to hear anybody else's kids if I were on a romantic B&B getaway with my husband, yk?
Honestly, I don't think their reply was rude, just to the point.
I understand your frustration, but I completely understand the policy. Like others said, I would hate to be on a romantic getaway and hear screaming kids next to us...that's the kind of place you often pick for a romantic getaway because of the very fact that they usually do not accept children.
And again, many b&b have antiques, collectables, breakables, fancy furniture, so even if your kids are perfect and wouldn't touch any of those things, I can definitely see that many of those places are not kid-friendly.