I think morals are entirely a personal choice.
There is a strong sociological argument that your parents dserve your love and respect, but it's not a theory i subscribe to.
I have my childrens' love and respect, because i have worked very hard at my relationships with them I don't expect these emotions by right - children are individuals, you form bonds or you don't.
My mother tells me she loves me, but never demonstrates it in a way I understand, and never has, as long as I have been aware of what love is.
I appreciate your perspective, and your discomfort at your situation, but you must work with your feelings, and your choices, and not be swayed by the views of the wider population.