If I had to pick, either Cheetos or the memetically infamous tendies
The only context it ever made sense was as a prepackaged junk food for places like schools and day care. Otherwise I agree it's pointless and nobody whose age is in the double digits would be caught dead eating it if they have any dignity.
Disagree because Mountain Dew is also popular among rednecks and hood rats. It's probably a lot more popular among rednecks than among the stereotypical "neckbeard" and has been a lot more popular with the hillbilly crowd a lot longer. The drink was literally invented in Southwest Virginia, right in the heart of Appalachia. It was called Mountain Dew because it was meant to be mixed with moonshine (since "mountain dew" is an archaic Irish slang term for moonshine or poitin)
This old commercial from the early 1960's is a lot closer to the actual main demographic of Dew drinkers today than any of that "extreme gamer" shit that made it get associated with neckbeards