You know something? I too had an experience like this with a Westerner on instagram. It turned out that he was an Indian who had left his country at an early age (2-3 years old he claimed he was when he left India) and settled himself in the US. This all happened last year before the events of Ukraine-Russia. And let me tell you, when I was argueing with him about how US ran from Afghanistan than he immediately started abusing me and India by Saying things like :
1. "India a cow-shit Country, US is far cleaner than Indian Scum"
2." You guys don't have toilets there" and blah blah blah blah.
Let me tell, the way he brought the topic of cows than I immediately knew that he was perceiving me as a Hindu, than when I told Him that I was not a Hindu and i was a Christian than he started accusing me of lying that I was a Christian. The guy was dumb To the core, in the end I Destroyed him in the comment section. The guy later ran away. Let me tell you, being a Christian but with Hindu roots, I felt very insulted by the way he abused Hinduism. Bloody Westerners.
The guy's account name was "NoSaints" or something like that. These idiots think that every Indian is a Hindu, which proves their superiority complex. (Lol) Even Indians settled in Western countries like US, UK are in the same category of Inferiority complex mindset.