why this mindset for everyone

today me and my friends were discussing something and my hindu friends brought up that they hate all Muslims (note : im from manipur and i follow sanamahism) and i tried to explain that not all of them are what you think and they started telling me that how they chopped cows and murdered Hindus . but i told that it's okay if you think those people are shit but its wrong if you view everyone with the same mindset that they might do the same thing .. i brought up my own example too that im a meitei from manipur and ik how meitei women got r#ped and how kuki women got r#ped too but i haven't once viewed my kuki friends back from assam as r#pist because ik they have no connection to those r#pist so there's no point to view them as one of those r#pist but my friends simply don't get that and started saying fir to tu hee ch#tiya hai