Yeah. I used to feel that way, but as I got older, it started to seem more and more silly, to but it bluntly. I can understand loyalty to friends and familty, but to a brand? It feels to me to be more about justifying a choice. "I chose brand X over brand Y when I bought this thingy. Brand X must be better, otherwise I made a bad choice." I still catch myself doing it, but I believe it gets in the way of choosing the best piece for the job at hand.
There are so many variables, how can you say what's "best"? For my everyday home computer, I felt that Windows XP was my best choice because I was going to be using it for games as well as photo editing. I'm picky about games as it is, and the Windows platform offers the best variety for computer gaming. When I set up my media server, I felt Linux was my best choice. It's very stable and could run on a cheap, low powered, and quiet machine. For some people, a Mac would be their best choice for a home machine. For others, OpenBSD. It all depends.
I'm partial to Mopars. I love their muscle cars from the 60s and 70s, and have owned several. But I have also owned a Toyota, a Nissan, and others. Each one was what I felt was the best choice at the time. If I had limited myself to only Chrysler, I might have had to gone without a car, or gotten one in such bad shape that it fell apart on me.
One of my pet peeves is when people make blanket recommendations based only on their personal experiences. It's not uncommon to see someone say "Buy this!" only because they've owned one and liked it, with no consideration for the other person's needs or situation.
/rant