Dan Collins, a disc jockey at KIKN Radio in Sioux Falls, South Dakota, got a tip that Walmart Great Value Ice Cream Sandwiches don't melt. Sitting outside on a sunny, 80-degree summer day, Collins watched the ice cream sandwich sit on a plate. Next to the sandwich was a scoop of Blue Bunny ice cream on another plate. After over an hour, Collins recorded the sickening results.
All of a sudden, I feel like hijacking an ice cream truck and seeing what other "delicious frozen treats" are suspect. Via Viral Viral Videos.
http://www.latimes.com/food/dailydish/la-dd-walmart-ice-cream-sandwich-wont-melt-20140728-story.html
TLDR: stabilizers and lots of fat, less water in the product
And in this case, the use of plant gums and emulsifiers to produce unique textures and different properties than expected is something people pay a lot of money for in various high end restaurants ("hot ice cream" that melts when it gets cold instead of hot was/is a big thing at some places, although that uses methylcellulose instead of gums). But when it comes from some place people don't like, it is jokingly expected to eat through plates.
While I will do practically anything to avoid going into a Walmart, I agree that a lot of the "WalHate" is arbitrary and could be appropriately applied elsewhere for the same "violations."