Tā yīnwèi shèjiāo kǒngjùzhèng 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 (shèkǒng) in internet slang, used loosely for 'I hate small talk.' The clinical term 社交焦虑障碍 is more precise. Opposite colloquial term: 社牛 (shèniú) — someone fearlessly social.