Limit, everyone has them, unlike any engineering formula, a human's limit is not infinity, and sometimes we cross the line even without realizing it, and we may hurt other people's feeling in the process.
Just because something does not hurt your feeling, it is not necessary that if you do it to another person, it will not hurt the person's feeling. And never never assume that is the other person's weakness, its just that is their limit. And don't think that you are invincible, its just that that is not your line yet, you may have weakness, but you have not encountered a problem that will challenge your weakness.
Nobody, and I mean nobody likes their weakness to be made fun of, or exposed in public. Talking in private is another thing, but if you want to let the whole world knows, that is just plain wrong. Even if its unintentional, it still hurts ok. Just like if I accidentally stab you with my knife, the hurt and scar will remain the same compared if I did it intentionally.Well, if people are short, they are short, if they are fat, they are fat, but there is no need to rub it in.
Accepting who you are does not give other people right to make fun of it. Its wrong, and if you have wronged anyone, you don't need a million dollars to fix the situation, just a humble apology will do.
And remember, sometimes karma comes back not to you, but the people that you care about, and it can be a bitch sometimes.
Just think about what I am saying ok. Peace.