What's the word for when a person chooses to believe something based on preconceptions rather than judging it objectively?
Here's an example (a little contrived but hopefully illustrates the point):
A person ,P, is usually very healthy and prides themself on eating good, healthy food. This person has two friends, A and B, and they share a house.
P is in awe of A and pretty much anything A does is "right". For example, if A buys a drink that's packed with sugar but looks "healthy" then they decide this drink is super-healthy and there's now always a carton of this drink on P's shelf in the fridge.
However, they're not so keen on B. B buys some food that's super-healthy. P doesn't even bother tasting this food and it never gets touched, despite being on the sharing shelf.