Why are managers so disrespectful towards young employees? Is it the same in most places?

It's my first full-time job. You can't expect me to be as good as an experienced employee and laugh at me when I ask questions some of my other employees don't have answers to. It is really disrespectful as a manager to laugh at your employee with other employees and tell them 'this guy is not from the real world' if I've barely graduated a prestigious uni with a high GPA. And I don't buy into this 'I am honest and I speak my mind with you. I am not a fake person' when I see how you bootlick other managers while you speak ill of them behind their back.

Why are managers so disrespectful towards young employees? Is it the same in most places?
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