Why is introversion a disorder but not extroversion?

[Insomno boy]

I'm an introvert. I'm not socially awkward, I don't get anxiety, I'm not shy. In fact I love being around people I care about and I get lonley when I'm not. I look forward to get togethers with friends and family. I can easily meet new people and get to know them. I just value a lone time and I hate small talk. I only talk when I have something to say or if someone starts a conversation with me. I prefer peace and quiet and relaxation. Being in public or in large groups for long periods of time is mentally draining for me. I'm also the type to not waste my social time/energy on people I don't like. So I may only have a few friends but they are like family to me. If I don't like you, or we don't have much in common, I won't put in effort to being friends. But if I do like you, then that means I consider you family.

People don't understand why I am the way I am. I've been labelled depressed, shy, socially awkward, the stuck up guy who doesn't talk to anyone. Just recently at work someone came up to me and asked me how I'm so calm and quiet all the time and if I had some type of social disorder. He's a very loud extrovert. Talks to everyone, talks loud, doesn't stop talking. Complete opposite of me.

So I'm wondering, why do people try to associate introverts with some type of mental disorder or problem but extroverts are accepted by society as normal. I think it's pretty normal to enjoy privacy, peace and quiet.

[Stormy thoughts!]

Extroverts tend to be psychopaths and introverts sociopaths on the norm

[Chrome]

Society is messed up. There are so many things wrong with people's opinions, but it's spread through traditions and social media. Maybe because many introverts are bullied because of their quietness, and therefore seen as lesser citizens? Or because quiet people can be pushed around easier so people take advantage of that? I'm not saying all introverts are 'pushovers', many take no shit from anyone, but people have assumed a stereotype and it stuck. There's a quite from Marina and the Diamonds that expresses your thoughts exactly (sorry if its annoying to post, but it's a good quote):
“Why is being a loner characterised as a ‘social disorder’? It makes me never want to speak to anyone again. It makes me annoyed to be labelled as ‘antisocial’/ socially anxious. I am in fact very comfortable in social situations, I just have a truthful and realistic view of the meaning of friendship and relationship-That you cannot get on ‘really well’ with everyone, you cannot even really ‘like’ everyone (though most people pretend to). In reality, each individual probably finds they don’t have a real ‘connection’/ chemistry with no more than 5 real people at any one time in their lives.
I feel like if you don’t get on really well with someone, there is little point in spending time socialising with them. Most events are full of people talking about nothing and this makes me feel even worse than staying at home, alone. Or perhaps I am just jealous of the people talking about nothing and cant step out of this godforesaken bubble that makes me want to never go out again.
Some people need time alone to process thoughts/ events and some people don’t. I will probably always be this way. Every boyfriend I have ever had has been a loner. I wish people wouldn’t make introversion into a personality flaw.”

[Beery]

It's the dictatorship of the majority. Most people are extroverts, so they get to decide that their way is 'normal' and everyone else is 'abnormal'. In my view, the extroverts are the crazies - they desperately need human contact, and if they don't get it, they act out, get depressed, some even kill themselves or others.

We're independent, fully complete individuals. They have an inherent socio-psycho-pathological deficiency that can only be filled by others.