Sri Gur Gobind Singh Ji was born in Patna, Bihar.
Granted, these individuals come with their own traditions/habits - chewing and spitting paan (tobacco) and smoking cigarettes which is bad BUT, this is not enough for one to discriminate them based upon their geolocation/caste.
The Guru's never discriminated other castes. Instead, they embraced them and taught them otherwise. I.e. Kauda Raaksih and Gur Nanak Dev Ji.
I'm against the caste hatred as it's simply not GurSikhi. GurSikhi is compassion, love, understanding and being righteous. There are other ways you can