Roz I was actually referring to a post on another thread about childless people being clueless, and various posts over the past few years accusing people of being child haters. It's cropped up a lot - I should have made that clear.
I'm sorry you've had difficulties getting on and off buses - and actually I don't think people are innately intolerant but I think there has been a marked shift in parental attitudes since, say, my parent's day.
People are generally more outspoken and vociferous about their rights, which you could argue is progress, but at the same time it is going to invite a more robust debate from people who don't have the same priorities.
I really wanted to make the point that actually, buggy users can have a sense of entitlement over wheelchair users, because I have seen it and in the interests of balance I felt I wanted to add it.