Oh wow, I'm so sorry to hear that someone is being like that to you...
There is no reason to be so hateful, ever.
You're right though, we shouldn't be hateful. We should be more like a family, caring for each other.
Again, I'm so sorry that someone is being that low. Just keep being yourself. Screw that person. Whoever they are... They are obviously so painfully filled with hate that they feel they need to attack you.