I'd be more a football supporter than a hurling supporter. More Cork people support the hurling team than support the football team, and complaining about those supporters achieves nothing. (aside: I wasn't there myself so a charge could as fairly be leveled against me)
I've no doubt that the Cork Footballers would love more support, and would likely thrive from it. Thank the supporters we have, and tell the others that we'd love to have ye supporting us too & leave it at that.
In the short term, there does need to be a change at administration level. Why organize a double-header like this when it's entirely predictable that a very significant portion of the Cork crowd will be walking out in advance of the football match, and a portion of who remain will actually be relatively indifferent to the result? It really rubs it in. I think men's/women's football double headers should be tried. The same problem might occur, but it might not, so it seems at least worth trying.