T’au are objectively good guys, they actually make use of diplomacy and aren’t genocidal like every other faction in 40k.

The only problem is they suffer from “villian who is right but kicks babies because EVIL” writing. That, or they’re made to look dumb and naive for not using violence as the first, last, and only resort (I believe there was a lore snippet where they try to engage in diplomacy with Tyranids).

People who says this shit are just wrong. They weren’t upset about him being older than their civilization, they were horrified that a civilization would do something so horrific to their own warriors.