
Think about it like this: if the people who were supposed to have your back and love you unconditionally, all of a sudden think you're a burden to them, it wouldn't make you feel too great. Like "My own family can't be trusted, how am I supposed to trust strangers" type of mentality. It just makes a person lose faith in their fellow humans, which is kind of sad.

It's that feeling of wanting someone to share your pain because you feel it's unfair that life dealt you a bad hand. It's selfish of someone (Kang in this instance) to want to forcefully hurt others because they've been hurt.
You're probably a great person, not wanting to hurt people just because you've been hurt. But I feel like being kind to other people when the world has been nothing but unkind to you is hard for other people, because it's like "what's the point"

this is the view of a person who has good mental surroundings, normal life, no huge bumps in the road, roof over your head, school is okay, have friends. Some people do not have normal lives and don't have a normal starting point. To them you sound like this: "golly gee, folks I sure wouldn't wanna hurt nobody just cuz I got my feelings hurt." Kind of like a naive hillbilly. So if someone without your life hears you sounding like Happy the Hick, they're going to want to hit you. more than once. lol wipe that happy as pie look off your face. teach you what life is really like. take you down a few notches, wipe that stupid grin off your face. See what I'm saying? Hell, even I wanna hit you. lmao
Imagine losing your parents at a young age, given to people who think you're a burden, then be physically abused for your entire childhood and into adulthood.
You don't have to like Kang but at least try to see the world in his shoes.
Or not. Up to you if you want to put things into perspective.