Answer:
(Fatwa: 840/308/TL=1432)
You should keep on convincing him with wisdom and politeness. Also, keep on praying for his reform and recite ya Lateef ya Wadood (یا لطیف یا ودود) 1111 times after Isha with durood 11-11 times before after the dua. In-shaAllah, he will be polite towards you.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
