My dad was a diehard Ford guy, much like Revman with his Toyotas. He only ever rooted for Ford drivers and loathed Dale Earnhardt and, to a lesser extent, Jeff Gordon and Jimmie Johnson. His one exception was Mark Martin after he left Roush for Ginn/DEI and then Hendrick.
I started out that way as a kid, obviously because of Dad, but I eventually came to realize that I was really more of an anybody but Earnhardt (and Gordon until later in his career) fan than a strictly Ford fan. I was drawn more to the drivers and my perceptions of their personalities than whatever decals they had on their cars. When I was going through my NASCAR hat phase, I remember telling Dad that I was gonna get a Jimmie Johnson hat. He was (playfully) disappointed. When I came home one day and saw the box with the hat in it in my room, he had written "don't do it, son!" on it.
I wonder what Dad would have thought of me becoming a Dale Earnhardt, Jr. fan after he passed away. He didn't seem to have the same level of dislike for Jr. that he had for Sr., so I don't think he would have been that surprised, especially if I got to explain my reasoning to him. But I digress.
My point is, there's no right or wrong way to be a NASCAR fan. It's a subjective form of entertainment, and different people approach it differently and get different things out of it. We may not always understand others' approaches to it - for example, I'll never understand how there are some people who watch this stuff purely for the crashes - but regardless of how I may feel about it, that's their right.