As far as I can tell the Icon of the Seas is basically fine; even on the environmental front (important!) I see no reason to believe it's worse per passenger than other ships.

A lot of opposition to it feels like elite snobbery against middle / upper-middle-class people.

Any good anti-Icon arguments I'm missing?

something people don't consider about environmental impact is the splurge—"My 25-room mansion is eco friendly so I'm eco friendly."

even if you're using econfriendly methods in your gigantic non-essential-thing (mansion,vegas casino,mega cruise...), your splurge footprint (resources, labor, land) is not eco friendly

AI x blockchain consultant.
Previously Head of Product & Marketing at @ensvision.

https://linktr.ee/mattgarcia

and i say this as a someone who thinks environmental impact is a very secondary factor when judging human endeavours 

i just find the 'splurge' contradiction in the people who care quite striking

Right but I feel like here people are unfairly carrying over the (usually correct) association of "big = wasteful", not taking into account that the bigness here is primarily not to pamper rich people, but to serve an unprecedentedly huge number of people, who would otherwise be split between multiple other ships.