people on the internet
A milkshake duck describes the phenomena on the internet for a viral story to appear wholesome, only to be ruined later by the backstory of the person or thing featured in the story. It is based on a tweet by @pixelatedboat that says "The whole internet loves Milkshake Duck, a lovely duck that drinks milkshakes! *5 seconds later* We regret to inform you the duck is racist".
"Did you see the video of the guy on zoom with the filter saying he was not a cat?" "I did! So funny. Too bad it turned out to be a milkshake duck."