Yes, that's not what I was implying though (or at least didn't mean to). I meant they can't both be right all the time. The point being that fans think their side is always right and the other always wrong. When the reality is their side is sometimes right and sometimes wrong.
Certainly in any specific dispute one may be correct. Or both partially correct. Or both wrong. And one may be better or worse than the other in sum.
But that also doesn't mean, as you and so many imply with these kind of statements, that both sides are wrong. It can be the case that one side is, in fact, correct, or less at fault than the other.
It's a fallacy that in a dispute both sides are always equally wrong, or that the answer is always exactly in the middle.