While I agree with the sentiment (and I don't think Americans from other parts of the country are any more "virtuous" than Floridians), I will say, as a Floridian has also spent extended parts of this pandemic in other parts of the country, it's impossible for me to deny there is a marked difference in the behaviors I see. Whether that is because of local government policy, personal attitudes, or something else, I don't know and can't say for sure, but there definitely is a difference. For example, I went out to pickup takeout last night here in Florida and saw a bar at the restaurant full with at least two dozen people, chatting and drinking without masks and no more than maybe a few inches between each party. I haven't seen that anywhere else in the last nine months (and I've seen people seated socially-distant at bars at restaurants elsewhere in the country), which is why it was so jarring. While everyone is entitled to make their own decisions and risk assessments, scenes like that get "picked up" likely don't inspire a lot of confidence in out-of-staters thinking about spending money to come down here.
I'm never a fan of generalizations by any means, and I know many Floridians who have taken this very seriously, myself included. In fact, I feel confident that the majority of Floridians take it seriously, but one of the challenges with this pandemic is that if only a handful of people don't take it seriously, it can affect everyone. That's what Disney figured out early on and got right. It's not enough for 70% of people to wear face coverings; you need 95% to really make a big difference. And I do think that when anecdotes like mine (and in my experience, it hasn't been an isolated incident) get out, especially when contrasted to what's happening in other parts of the country, it can be off-putting and not particularly reassuring for someone traveling from an area where that isn't commonplace right now and is being actively warned against.
For me, I take the precautions, self-regulate, and act as my own best advocate. But I also have reasons to be here well beyond WDW or tourism. For most of Florida's out-of-state tourists, that's not necessarily the case. It's much easier to say "I'm not coming; it's not worth the risk." And personally, as someone who wants to see as many Florida service employees go back to work (and stay back to work) as possible, I think it would be wise for the state to focus on inspiring confidence in the health and safety measures for out-of-state visitors (much like Disney has done with their latest ad). A different decision was made, so we'll see how it pans out.