मूर्खा न द्रष्टव्या द्रष्टव्यास्चेन्नतैस्तु सह तिष्ठेत् |
यदि तिष्ठेन्न कथयेद्यदि कथयेन्मूर्खवत्कथयेत् ||

One must not see a fool. Avoid him. If you happen to see one, then avoid standing next to him. If you happen to stand next to him, avoid talking to him. If you absolutely have to talk to him, then talk to him like a fool only. A fool will not understand any way of communicating other than his own  way.