Why do we let these people call us "the other"?

When there is such convincing evidence about how it was us in this land for all of history and the history of South Asia. Why do we allow shit like this? Even with the Rama bridge dates being pushed back by 7,000 years, we still know that we have been around in South Asia since at least 5800 BC and have irrefutable evidence of the Sarasvati-Sindhu river being around in 1900 BC. Yet why do we allow these racist claims to be put around and why do we shit on our own history and doubt the Rama and Krishna claims, in fact, calling those who believe them as idiots?