you can't be so arrogant as to think you have it all cracked and your parents knew nothing.
No - generally speaking, the bits the previous generations got right, people still do, they just change the bits that no longer work / do not work for you.
There's much of my (very happy) childhood that I have emulated and copied with my own children. But the bits that I think weren't as good, I've changed. I think most people do this. I don't think I personally know of any parent who has ignored everything from their childhoods, unless they have had very good reason. Most people I think take the best bits from our parents, and mix it in with the best advice available at the time.
I would say my mother did this (and yes, she also moaned about my MIL's advice who thought she should follow 1940s/50s parenting techniques in the 70s) and I remember laughing with my Nan at some of the advice she was given in the 50s from her parents who raised children in the 20s and 30s. Evaporated milk for newborns, If a baby is teething, dunk it's dummy in a bit of whiskey? (I actually remember my nan doing this and my aunt going mad about it!)
Thankfully, my mother doesn't say this to me. In fact, she can see the changes I've made and generally agrees that they're for the better. When she disagrees she has enough respect for me to recognise that I'm raising my own children the best way that I can, in the best way I see fit and she doesn't denigrate me for that. Neither does my MIL. But on the flip side, if I'm unsure I do ask my mum for advice and what she did. Doesn't mean I'm going to do the same as her though!
But in turn, I would never criticise, ridicule or suggest that my parenting technique was better to any modern mum who does things differently to me... To me, it's just a basic matter of respect.