It isn’t just young people today…it’s young people throughout time. The OP used a citation that has some fake (or probably fake) quotes on it. But the idea isn’t new. You are looking at a generational difference.
Every person, when they are young, is looking for ways to declare independence, to take their parents’ learnings and outdo them, to make their mark in the world. They are full of new ideas they want to push.
Every person, as they get older, see the younger people acting like they know it all, that they are invincible, that they malign all that the elders have gone through, discounting it as being useless.
Both sides are correct and both sides are wrong. Young people, in their efforts to spread their wings, come up with a lot of ideas. And like most ideas, many of them are really bad ideas. They don’t have the experience of life to temper their thinking so they want to rush forward and repeat many errors that their elders have likely already made and learned from.
But just because you are older and have more experience doesn’t mean you know everything or have thought of everything. And yes, many of those ideas from the young people are really stupid. But some are not. Some have true merit and can be the building blocks of new ways of thinking, living and thriving. The enthusiasm and drive that spur these ideas are what often gets tamped down as we get older and more comfortable in our existence.