It's easier to practice empathy when you're not blindly guessing at what bothered the downvoter.
"ur dumb and wrong .stay mad!"
Likewise you seem to need to take your own advice to brainstorm to understand why it is likely to add value to someone else leaving a comment and not simply requiring you to brainstorm and make guesses, e.g. bias and blind spots a person may have; what other possibilities are there?
Edit to add: 2 upvotes then down to -1; it's hilarious how bad and poorly used downvotes are.
What makes you think they do? You think you could use something, that doesn't mean a stranger owes it to you.
If you change seats to get away from someone on a bus, do you tell them why? If not, how would you feel if they followed you and said you embarassed them and you owe them an explanation?
Furthermore, I would argue that self-reflection about why people might disagree with your viewpoints is a valuable experience in that it provides an opportunity to practice empathy and awareness in how your words are perceived by others.