Coping with "kids"

So how do you do it. All kids have the mentality of being self-centered, and in some cases, "brats". Psychologically, this is just a phase they go through because its a natural part of growing up. Being someone older, usually the older person has to be understanding of them and not just be really pissed off at them.

So how do you tell a kid that what they're doing actually annoys people when you know that they don't have the mental capacity to understand other people's perspectives?

I teach kids for CA$H...
Kids understand the basics of cause and effect especially on other people.
You sometimes just have to remind them that their individual actions will effect others. And use words like friends or classmates when referring to those that they are effecting.
Generally they will respond positively.