I generally see more people being helpful to others than people being rude to others.
I'm engaged with young people 4-6 days/week, 10 months out of the year....this is my 13th year. I see far more good kids than I do bad kids....the ratio of good to bad isn't even close. The bad kids tend to take up a disproportionate amount of our time and energy but that's just the way it is. There are some truly AMAZING young people out there.
The key to seeing it is being around them enough to have an opinion. The occasional interaction with a young person isn't a good gauge of anything.
*if you are a person who believes today's youth needs help then volunteer to help instead of complaining about how terrible they are going to be as adults...that statement is not directed at the OP...that's for everyone