We live in a world where people are quick to criticize others. Before you open your mouth to criticize others, check yourself first, you might be worse that those you are criticizing.
You don't actually know the way you sound, because you cannot hear your own voice. Only others can only tell you the way you sound because they can hear you. Also you don't actually know how you look because you have not seen your face, only your reflection in the mirror, and they are not your exact image, they are just distortions of your real self. Your character is well perceived by others, they are the ones that will tell you how you really behave and act, that is why an actor can never watch himself when acting, it is the director that sees him.
Knowing all this, think first before you start criticizing others, you don't even know yourself yet. Chances is that most of the people you criticize are actually better than you, but you don't know, that is why you choose to engage in such criticism. Think of yourself first before you decide to become critical of others, you can be worse but not yet, stop criticizing people blindly.
No one is perfect, and no one will, if you want to criticize others ensure it is constructive and for good, and not to make others feel lesser than you or themselves. You are not better than others, the problem there is that you are not yet aware of it.