Nothing worse and one sided rivalry.
Most rivalries are one sided. In international football, it's more obvious I think. Scottish supporters think they have a huge rivalry with England, but most England supporters - even now - probably regard Scotland as a minor irritation, certainly not on a parr with such giants as Iceland.
For English supporters, the big rivalry is, of course, with Germany. But, I understand the Germans don't have the same perception. Somebody told me that they are more concerned with the Netherlands.
All this is just so I can quote one of my favourite lines from The Unbelievable Truth.
"England Germany is always a big game, although, for Germany, there are usually bigger games to follow" ~~ Henning Wehn.