I just can't take the assertion seriously. Saying someone should abstain from giving money to the Disney Parks if they really want to make Disney listen, or that Disney fans should "put their money where their mouth is" is just so reductive and absurd.
I can speak from experience! I personally never gave any substantial amount of money to Disney for a good 7 years or so. Not purposefully perhaps, but it kinda worked out that way! I didn't have an AP, never bought merch, on the off chance I ever went it was usually through a friend's employee passes or something to that effect, and despite my boycott, Disney still implemented Genie+! What happened? Was it my $19 dinner on that employee ticket-park day that funded that operation?
It's silly. We are diehard fans of theme parks, more than anyone else we are going to have thoughts and criticisms on these parks and the way they are run. And to gatekeep that discussion behind an ask so absurd is pure ridiculousness. No one person's AP, or merch sale, or Marvel movie ticket, or $19 dinner is going to effect the bottom line for Disney. Even if all of Disney's core fanbase were to turn on them, the sheer force of Disney's juggernaut branding and connection to American culture is so impossibly strong at this point that I doubt they'd honestly feel much at all. Disney is the largest theme park corporation on the globe, and barring unmitigated disasters like Starcruiser which failed on their own, there is no way to really touch them through anything resembling a boycott.
I don't think getting a Park Reservation for Animal Kingdom is any more of a personal endorsement of the reservation service than going to Islands of Adventure is an endorsement of JK Rowling's Twitter account. We're theme park fans talking about theme parks, and some of the biggest ones in existence. They have their hands in a lot of places and get funded through a million different complicated avenues. I think it's totally fine to be an AP, to buy all of the exclusive Figment Loungeflys, to nab tickets for exclusive event nights, and to still believe that the parks are underbuilt, aging, being used as a money farm for other less profitable ventures and follys of the Disney company, and frankly not be giving as great of a guest experience as possible. I don't think there is any contradiction between the two, or that the company's policies would change if any substantial portion of our niche community were to abstain from visiting the literal most popular theme parks on Earth.