"Bihari" is not racist.
"Typical Bihari" is, learn the basic difference between these two before taking Singular Words out of context according to your convenience.
Devnagari Script is not something that's limited to Bihar. Uttar Pradesh, Madhya Pradesh, Uttarakhand, Himachal Pradesh... The list goes on.
You want to play language politics be my guest, what's racist WILL BE CALLED SO.