why is being nice not a default attitude of everybody?

nobody knows how sensitive i am. nobody knows or even cares when their words hurt me. maybe because i'm having pms. so i become extra sensitive. but it doesn't change the fact that their words hurt. when people release their tension or anger through their words to me. i don't do that. unless i am under extreme pressure. i'm not sure if i have ever done that. so i feel wronged, whenever these people do that to me. 

why can't people speak nicely? why can't people stay calm? i know, i know, everybody manages things differently. when they accused me of lying. honestly, i can accept people scolding me with nice words. but when people start scolding me, or even accusing me, by calling me liar, that's when i lose my respect for you. when you didn't even check what's wrong. when you didn't even ask me first why it didn't work. so when i arrived you spoke so loud everybody could hear you, calling me a liar. maybe you couldn't think well because you were stressed out. still, that was just so rude of you. and you didn't even apologise, right? 

well, i could have scolded you back. i could have said something so offensive to you. but i didn't. i replied you with a smile. i was smiling but nobody knew it hurt me so fucking much. but i will let it go. maybe i'll forgive, or maybe not. but i won't ever forget. letting go does not mean forgetting. 

almost two years with these bunch of people. the more i know them the more i feel we are so different from each other. the more i feel that there's so much negative vibes around us. and we're all selfish. we all think about ourselves, first, in whatever situations. 

if anybody sees me, they probably think i fit in well. if they have that thought, well they don't know anything. two more years. i can do this.