They might have strongly disliked something specific about the flavor of the coffee (e.g., too bitter or sour, to the point of being justifiably called terrible), but they didn't hate it overall and would still drink it given that same opportunity. That's how it usually is.

I feel pretty much the same way about coffee.

Gp could dislike the taste and still enjoy the experience of the beverage overall, satisfying the condition of the original statement.

Also, it was probably written that way as a bit of a joke.

You can hate something and still enjoy doing it.

Smoking, a bad partner, bitter coffee.