GW does not hate non-Space Marine armies. They just don't give a FAQ.
This song is totally the Battle of Prospero:
LanceWarrior: "1st rule of 40k forums rule-lawyering: Don't argue with Baragash"
Yahtzee: "It's like owning a giant swiss-army knife with 500 different little blades and one folds out into a mini-gun. There is no reason to use anything else."
Clicky in case of emergency