A lot of these comments are just downright silly.
I completely agree with you. It's a personal choice. If someone doesn't want to upgrade, fine...so be it. There is always going to be a difference of opinion. I personally like the design look of iOS 7 a lot. I went back to iOS 6 for a week and did not like it but I'm of the personality that loves changes and new things. There are lots of people who like the familiar and resist change. Everyone is different.
I do have to say though, that although it's silly for people to lambaste the OP for his decision, I also find it peculiar he posted to begin with. You have to admit you are opening yourself up to criticisms when you not only public decree that you hate iOS 7 and will stick with iOS 6, but also say it in a way that to me, appears like his/her underlying message is "you are all stupid for liking iOS 7" and to me, that's just as bad.