For the classic classist dog whistle you're looking for a few things. You can't just say "screw the poor" or "screw the bourgeois" you go after behaviors, interests, and appearances. You describe them as rude, ignorant, or criminal.
Here, from the article, for example: "...selfie-stick deaths, all-you-can-eat ships docking at historic ports, stag nights that end in property crimes, the live-streaming of the ruination of fragile natural habitats..."
- So, selfies / selfie sticks leading to falling off a cliff (rude and dangerous)
-All you can eat ships (cruises, gluttony, probably fat people) going to historic ports (stinking up the place)
-Stag nights leading to property crimes (fornication and loud partying + criminals)
-live-streaming of the ruination of fragile natural habitats (a lack of shame and propriety + ecological damage)
So, just from that, I can tell you this is a hit piece against the not-quite-poor, like I could tell you one from decades past would mention tchotchkes, or dancing, or casserole.
edit: pardon the borked formatting.