"None of you will have faith till he loves for his brother, what he loves for himself" - Bukhari Book 2, Hadith 12
Many Scholars (including An-Nawawi) interpret the word "Brother" here as brother in humanity
Therefore I always treat my fellow human being with respect, whether he's muslim or not because that is how I would want people to
treat me. I know that the Prophet peace be upon Him used to treat non muslims with utmost respect. Even when they disrespected Him,
He would return their rudeness with kindness.
So please don't look at you brother in humanity with animosity. But look at them with compassion and mercy like our Beloved Prophet did,
sallallahu wa aleyhi wa sallam