1. Candy/sweets are a luxury and I would not be shocked if a lot of lefties grew up with parents that were stingy on giving them candy, ice cream, milkshakes, etc on demand. Especially if they grew up in a school or household with someone with a peanute allergy (meaning that a lot of candy was forbidden due to it having peanut butter/peanuts).
2. A lot of these fucks can't afford sweets on demand or are purposely denying themselves sweets due to them being vegan and it makes them lash out at people who CAN afford double scooped ice cream cones or candy on demand.
3. Since Trump doesn't use drugs or drink, the closest thing to a vice they can attack him over is his junk food habits. Especially since Michelle Obama made a huge stink (and got rejected HARD) when she tried to force her 1%er mindset on nutrition onto families and schools.
Most atheists are people who had fundamentalist/very religious parents and a lot of these types become atheists solely to rebel against their parents and throw it into their parents faces that they permanently turned their kids against the very idea of God because of <insert real or imaginary or both slight the parents inflicted upon the kids to turn them against God>.