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Imperium Lib: "yeah sure sure the Empire does some bad stuff, but the Tau literally sacrifice children!"
(hexbear.net)
Gue'vesa Chad: "your source for that is Comm-Link Free T'au."
Lib: "and?"
Gue'vesa: "they are literally funded by the Logis Strategos!!! I've literally been to T'au and they don't sacrifice babies."
Sometimes it’s because tau are annoying to play against.
Sometimes it’s because Tau players can be very weeb.
Sometimes it’s because Tau are the least evil or corrupted of the 40k factions and a big chunk of 40k players can only say “exterminatus”, “purge the heretic” or “xenos scum” and have made the human factions xenophobia and space fascism their whole personality.