You are claiming to speak for all introverts, which turns this into an "introvert v extrovert" discussion. In other words, you are saying that half the population is forcing themselves onto the introverted half of the population. In reality, introverts are often the MOST happy that someone else initiated a conversation that they would be too shy to start themselves.
In reality, the situation is more like "NTs v non-NTs", and you are speaking for the non-NT part of the population. The same way you say half the population shouldn't force their preferences on the other half, I'm sure you can agree that 5% of the population shouldn't force their preferences (of non-interaction) onto the other 95%. Especially when the cost of nobody ever initiating conversations is significantly higher than the cost of being momentarily bothered by another person.
Actionable advice (for stopping an unwanted interaction): Answer in monosyllables or "hmm.." sounds. DON'T look at the person and smile. Maintain a neutral expression. Pull out your phone or a book, and direct your attention towards it, instead of the person.
Ways to end the conversation in a polite way: Say "Well, it's very nice to meet you." then turn your attention to your book/phone, OR add "but I'm at a really good part in this book, and I want to see what happens next....I really need to get this done... I'm really tired and was hoping to rest on the flight...etc." It's alright if the reason is vague. It is generally understood that providing a weak excuse is just a polite way of saying "no", and everyone plays along.
In reality, introverts are often the MOST happy that someone else initiated a conversation that they would be too shy to start themselves.
Not all introverted people are shy, and vice versa. Personally, I do not have a degree of shyness that holds me back from the level of social contact I want.
...Ways to end the conversation in a polite way: Say "Well, it's very nice to meet you." then turn your attention to your book/phone, OR add "but I'm at a really good part in this book, and I want to see what happens next....I really need to get this
r/Fitness does a weekly "Moronic Monday", a judgment-free thread where people can ask questions that they would ordinarily feel embarrassed for not knowing the answer to. I thought this seemed like a useful thing to have here - after all, the concepts discussed on LessWrong are probably at least a little harder to grasp than those of weightlifting. Plus, I have a few stupid questions of my own, so it doesn't seem unreasonable that other people might as well.