The post earlier this week entitled 'You win nothing with kids', struck a chord with a number of readers.
Perhaps the sensitive nature of the topic dictated that the commentary mostly happened through private channels, heh.
I am grateful, however, to Harshal (and I hope he doesn't mind being identified) who reminded me of this one from the Ernest Wooley charachter in J. M. Barrie's 'The Admirable Crichton'
It's appears that GenY over confidence was also a conversation in 1902.
The quote itself is often mis-attributed to Oscar Wilde.
In Wilde's 'Phrases and Philosophies for the use of the Young (1894)' he declares 'The old believe everything; the middle-aged suspect everything; the young know everything' however the Ernest character in '...Crichton' is widely believed to be a caricature of Wilde's character in'The Importance of Bieng Earnest'.
As I suspected.