Actually yeah, they are quite tolerant. People with social anxiety shouldn't be outright babied, that's condescending and rude in of itself.

If your social anxiety is so bad that you can't a) summon some form of enthusiasm for the things you've been gifted (the day out, etc.) b) summon one or two words 'thanks', 'thank you', 'cheers', etc. and/or c) pull your own weight at the meeting financially or even chore-wise, then you shouldn't expect others to bend over backwards to make excuses for your rudeness.

That's not something that you not notice, even if you're not inclined to give it a name.