> Beliefs can't be "gross"
of course they can, like believing that mexican people are inferior or something – gross
> they can only be true or false, justified or unjustified
this is incorrect
> There is no such thing as a morally wrong belief
this is also incorrect
> That would be the confusion between fact and value.
this, too, is incorrect
When you believe some belief to be "gross", this changes nothing about whether it is true or justified.