My parents' taught me good manners.
My Private Girls' School, had an educator, every month, in Grades IX-X, come & lecture us, in all areas' of etiquette, & good manners.
All that I learnt, I continue using to this day, & many people get a shock, when I show such! They're not used to seeing/ hearing the proper way of civilised behaviour nowadays.
I will not 'start' on ways of manners bad, as there's not enough room here!
Another reason, IMHO, for degradation in many good manners, respect, & dress, is the abandonment of National Service. Oh, & there was LESS crime then.
That was a good(?) idea labor, & Whitlam, & this Country's paid for that p@&$ poor decision ever since.
Two years, both males, & females, at 18 years of age. They'd be much better persons, for themselves, family, AND community afterwards!