Life should be like this?

Is everyone in this world makes friend loke this?
If there are not any benefit then couldn't be friend?

this world is so cruel that you treat other well but then others treat you oppositely...
everythings that is done is only to make friends but till the end,you will get treated badly...
others may treat you as a driver when they talk in their daily life...
when met with situation that need car,he will of course think of you and say that "yea you got car...go any where also can..."
but when you met with difficulties like unsolve problems in acedemic,you speak out your question,he will be answering you"i don't know..."or just act like heard nothing..
while playing games....that's more sucks....
take dota as example....he go alone then 1 on 5 sure die....then he will say you"don't support....your hero sucks.....everytime you don't help....you let me die..."
It's so ridiculous.....and makes other feel bad....and treat other like treat you well is a must?
why can some people just behave like this?

maybe they don't realized that the way they talk will hurt....
maybe is my fault or i hurt others when i talk.....
so everyone will make this mistakes......
hope that whoever that seen this post don't angry of me....i doesn't mean any1...
just to remind you all that care for others' feeling during daily conversation...
of course i will also try hard to change my bad attitude...