I think all families do things that others would consider odd and cringworthy, behind closed doors. Just most of us don't allow them to be shown and therefore dissected on Ch 4.
Yes, shame about the stereotype, but to be fair it seems to me that only lentil weavers feel strongly enough or comfortable enough about public extended breastfeeding to do it. Hard to shatter the stereotypes if none of you hot shot city girls will get them out, either in the park or for the cameras.