Why are pickup truck owners so brand loyal and hate on all other trucks?

I own a 2011 ford F150 with a lift, bigger tires, some engine work, and other goodies. I love my truck but I've had it for 9 years so I'm ready for something else. I'm looking at all manufacturers and leaning towards a Chevy 1500. I couldn't care less if I end up with another fire or not.

Why are others so brand loyal? A ford owner will only own ford for life or a Chevy owner will be Chevy for life. They won't even consider another brand and hate on all other trucks for no reason. I don't understand.

I have been a loyal GM customer for over 50 years through all the problems. Every manufacturer went through problems. GM just happened to take the brunt of it. I have no problem with people liking one brand over the other. They just realize GM is better ( now watch the thumbs down I get over this )

Looking back at all the pickup trucks I have owned over the years, I have owned Chevy, Ford, Dodge, Toyota and Mazda, but I think probably more Dodges than any other brand.
I don't HATE other brands, I just like the style of the Dodge (RAM) more, and when I bought my 2015 Ram 1500, it was the only full-sized 1/2 ton pickup available with a diesel engine.