What's so bad about being an introvert and about introversion?

I have seen a number of questions about the way introverts feel about extroverts and extroversion on Fluther. I didn’t find any questions from extroverts pondering on how they could change or are they misunderstood by introverts etc.

Examples I found include:-
Some questions paraphrased for brevity

Why are introverts frowned on? Are they?
How many people are introverts? Which goes on to suggest introverts don’t like clubs or socialising.
Can extroverts and introverts accept each other and coexist in society? I thought we had and do!
Introverts, do you feel you’re not understood by extroverts? I think extroverts could probably ask the same question.
Introverts, do you make assumptions about others?
Is it possible for a person to become more extroverted? Why would you want to?
Introverts, do you feel you don’t understand extroverts?
Do you have to be an extrovert to be an entertainer?

Only one Q asked if extroverts could become introverts.

I did a Google search and the same sort of questions and ideas came came up. There were questions about how to become more extroverted, posts about introverts not being failures, revenge of the introvert, the upside of being an introvert and why extroverts are overrated, things extroverts should know about introverts, things introverts get sick of hearing, ‘I thought I was damaged then I found out I’m an introvert’, and so on and on. I found pretty much nothing that said how to become an introvert, help me I’m an extrovert, a million things introverts should know about extroverts etc.

So why is this? Why do some introverts feel there is something negative about being an introvert to the point that some want to change or some seem to feel extroverts want to change them or look down on them?

I just don’t get it.