And I'd like to know why people do this.

Say you and your parent don't have a good relationship and you vent about it to someone.

They respond you should get over it because they lost their parent and would do anything to have them back and you're selfish.

Say you complain about pregnancy symptoms, someone responds that they'd do anything to become pregnant and you're ungrateful.

Say you're dog is driving you mad barking and they say if you can't handle a dog, you need to give it away, that you're a bad person.

Why is it some people feel the need to respond that way?

We're human. We're allowed to vent. People who have problems aren't going to solve yours by changing how they vent.

Why do people do this?