Objecting to certain individual actions is appropriate, I believe, but I don't think Disney has a say in the "gay days" promotion, do they? I was under the impression that the promotion is from without; that the participants started it. Disney obviously can't "ban" them from coming, can they?
These are the same folks who want you to boycott Shrek 2 because it promotes cross dressing and transgerered-isms or something.
I'm almost certain Mr. Eisner could disallow the use of the name "Gay Days" in connection with the park, if he wished.
As well, they could bring in "truckloads" of police to make sure that no lewd acts are committed during "Gay Days" if they wished to take that route.