Why do some people have total disregard for the feelings of another person?

They are selfish, and lack compassion and understanding. Some have hardened their hearts, or are emotionally unavailable. Depends on what a person has gone through. They need prayer. When we look at people through the eyes of Jesus, instead of the outward facade, we see someone who is hurting, then acting out. It’s really a cry for attention, whether they have to get it through positive or negative responses, doesn’t matter to them. They just want the attention, like a lost child. Someone who needs a friend and help/guidance. However, some just enjoy hurting others. They don’t want help.

It never occurs to them to think of other people. Some are just so selfish they never even consider others.

they have better things to do

Narcissistic

Narcissism.

Great question. Don't know the answer but I can confirm for you that it is most people and not just those around you.

Many reasons. Tact is a dying art. Most it's because of selfishness, I think.

Bc other peoples feelings dont matter unless you want something from them

They are cruel if we could understand it,we'd be cruel,too.

Sometimes the other person wants too much from them

Lot of people are super shallow.

they are r-soles

Narcissistic