Note that they did not "publish" the picture. They shared it in a private group. This is 1984 kind of stuff. This will hurt Dubai's brand way more than any kinetic attack from Iran.
Dubai's brand (before the war) was "you're welcome to come here to make money, but criticize the government and you're out". I'm sure there's a ton of young influencers who don't know the first thing about the place to not have internalized it, but I remember a spate of articles and books about 15 years ago of Westerners falling afoul of the local laws and losing everything.
Yeah, tbh people not scared by stories of people as wealthy and white and Western as then being prosecuted for kissing their unmarried opposite sex partner on the beach or falling out with the wrong person are not going to be worried about how wartime paranoia interacts with airline employees
There are a lot of things that I would expect to hurt Dubai's "brand" but people still travel there. I don't understand why anyone would travel there in times of peace, let alone during war. You don't even need it for connecting flights.