I think everyone having a flag just to show some pointless jingoism is distasteful. But if you are going to go so far as to cover yourself in the flag and use it as a prop to convince yourself or others of some shallow value, then you’re a douchebag if you don’t also take on the responsibilities that come with it. If you’re going to try to use whatever advantages you see in flag-showing, you should take the responsibility to treat it in line with what would be expected of you.
Waving flags and then failing to take care of them just highlights that you’re a douchebag that doesn’t actually give a shit but feels like they can the jingoism club by setting it up one day and forgetting about it.
I’m not saying all people that fly flags are douchebags, by the way. If it has some real meaning to you, for example if you’re a veteran or whatever, that’s fine. But then I’d expect those people who it actually meant something to would take care of it. It’s the WHEE I’M GONNA BAKE AN AMERICAN FLAG CAKE pointless jingoism crowd that’s the most irritating.