Do you find sectarianism in your Book? No, you don’t. On the contrary, you find that it is vehemently condemned.
Turn in repentance to Him, and be conscious of Him and establish prayer and do not be of those who associate others with God. Or of those who have divided their religion and become sects, every faction rejoicing in what it has.Qur’an 30:32-3
So leave all that stupidity, trying to work out what your companion is on before you decide whether or not to treat them with respect.
And hold firmly to the rope of God all together and do not become divided. And remember the favour of God upon you — when you were enemies and He brought your hearts together and you became, by His favour, brothers. And you were on the edge of a pit of fire, and He saved you from it. Thus does God make clear to you His signs that you may be guided.Qur’an 3:103