Since its effect is directly proportional to the cost of the purchase in question, it would make sense that relatively expensive objects, such as smartphones and computers, would trigger a correspondingly stronger negative reaction to criticism of said product.
I'm not doubting that there is post-purchase rationalization. It's just weird to read it from my comment. You think the functioning of OS X's home directory encryption makes me feel threatened because I'm a Mac person?
No, it wasn't. It was directly in response to another comment someone else made, not you. They asked a general question, and this person answered that general question. Your comment might have sparked that general question, but it was not the focus of it.
Seriously, not everything need revolve around your one comment. FFS.
Dissonance model has been shown to not be proportional to price. Which is intuitive as you see fervent defending of brands for products such as beer, wine, websites etc which are relatively low cost or have no cost to the user.
Since its effect is directly proportional to the cost of the purchase in question, it would make sense that relatively expensive objects, such as smartphones and computers, would trigger a correspondingly stronger negative reaction to criticism of said product.