Well this wasn't a mistake was it, it was quite deliberate and planned, and nobody humiliated him - he did that all by himself.
Ok of course I do accept he's out of his comfort zone, but why on earth would he do something guaranteed to embarrass his daughter just a few days before her wedding?
Just how much does Harry know about this family? I know he's besotted with Meghan, but surely he needs to be certain the family (or at least the parents) know how to behave, and are discreet. Apparently the mother has been on Oprah's show!