This is true to an extent, but I think there are two important things to caution against. One is that it is super easy for a lazy person to say "you just care

This is true to an extent, but I think there are two important things to caution against. One is that it is super easy for a lazy person to say "you just care about this more than me" when in fact they care about it a lot and will complain if it doesn't happen. This is extremely common, particularly among men, even if I assume in good faith you are not one of these people. The other is that when you enter into a relationship with someone it is just not possible to completely ignore the things they like and are emotionally invested in. If you marry someone who is a super-christmas-enjoyer then guess what, you are a super-christmas-enjoyer now too (or, to be fair, you are now both somewhere in the middle). Ignoring that you have very different expectations will just cause friction. (so if you really really don't want to care, you are going to have to consciously discuss this and agree to it, and even then I don't actually believe it will work)