I agree, to an extent. Having social anxiety sucks, because you often know that you're coming off as standoffish or selfish without really knowing how to fix the behavior. My social anxiety once got so bad that I was forced to quit university because I was refusing to talk to anybody, even in class. That's how embarrassed I was that I would say something "wrong" in front of people. :(
With that being said, it bothers me that people (not you. I mean people in general) blame rude behavior on their anxiety. Having social anxiety =/= being an asshole. And tbh, it sounds like the OP's friend was more of an asshole than anything else. They expected OP to pay their way, and never once said thank-you or offered to pay for a single meal or ticket? That's just assholeish. Even the most socially anxious people know what politeness is. They might say "thankyou" at an awkward moment, but they still know how to say it.
As far as I'm concerned, there's no excuse for a lack of politeness.
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With that being said, it bothers me that people (not you. I mean people in general) blame rude behavior on their anxiety. Having social anxiety =/= being an asshole. And tbh, it sounds like the OP's friend was more of an asshole than anything else. They expected OP to pay their way, and never once said thank-you or offered to pay for a single meal or ticket? That's just assholeish. Even the most socially anxious people know what politeness is. They might say "thankyou" at an awkward moment, but they still know how to say it.
As far as I'm concerned, there's no excuse for a lack of politeness.