You can have your experiences and draw your conclusions, form your hypotheses. You can attempt to predict future outcomes based on prior experiments.
But you have to allow for being human.
Which means, actually, that you can't do any of those things.
You can think you've got it all figured out. You've seen it all before.
But the endless combinations of human emotion and experiences, environment, nature, and the wisdom of the Universe will always always be able to show you something new.
If you are open to it. If you don't stubbornly cling to the scientific method to make sense of your surroundings. To make sense of other people. 
People can say and do some dumb shit. This doesn't mean you are better than them. This doesn't make them unworthy of love. This doesn't make you unworthy of love. 
What is more important is the direction they are heading. 
Prove them wrong. Be the exception, the outlier to the rules and formulas and statistics they have painstakingly figured out for themselves.
People aren't perfect. But people are good. 
We are all doing the best we can with what we have been given, with the experiences we have had. People aren't simply "dumb" or "smart." They are people with beating hearts and active minds, and they, just like you, want only to be happy. 
Try to help them. Help them find their own way. Which may or may not be the same as yours. 
The world doesn't need more people pointing out how dumb and wrong and broken and hurt other people are. The world needs more love.