I don't think there is anything wrong with having strong brand preferences based on reputation and personal experience. The issue is when people become fanboys.
The worst one IMHO is YETI coolers. Sure their stuff is well made but the prices are obscene, and there are loads of absolute tools who will buy everything they make and make a cooler brand their whole identity. $40 for a 5 gallon bucket? Come on.
The new Stanley cup collector craze absolutely. It's bonkers.
That said Stanley makes high quality stuff at far more reasonable prices than Yeti. I have a Stanley coffee thermos I have used every day for almost a decade. It was like $30.