Idha, gahapati, bhikkhu gihīhi asaṁsaṭṭho viharati na sahanandī na sahasokī na sukhitesu sukhito na dukkhitesu dukkhito, uppannesu kiccakaraṇīyesu na attanā tesu yogaṁ āpajjati.
It’s when a mendicant doesn’t mix closely with laypeople, not sharing their joys and sorrows—not happy when they’re happy or sad when they’re sad—and not getting themselves involved in their business.