That "we" was a very exclusive club by design, and now that people outside it are trying to butt in, it is only natural that doors would be slammed in their face. The idea that the club was open to all was a fiction, told in the knowledge that only "we" had a voice to speak with anyways.
In internet forums, criticizing or mocking Hindus is perfectly acceptable but any comments trying to present Hindu culture in a fair light get quickly classified as nationalistic or flamebait. The canonical example being r/India.
We're still years away from where this bias is seen and acknowledged for what it is.
For what is worth, I saw nothing in the original parent comment to classify it as flamebait. It was a perfectly valid opinion about how Hindu texts have been misrepresented by Western scholars.
Thanks Krishna for your comment, I for one learned something from it.