Tā yīnwèi shèjiāokǒngjùzhèng jùjué le diàntī lǐ de wènhòu.
Her social anxiety made her avoid greetings in the elevator.
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Often shortened to 社恐 in internet slang, used loosely for 'I hate small talk.' The clinical term 社交焦虑障碍 is more precise. The opposite colloquial term is 社牛, someone fearlessly social.