Looks like propylene glycol is used in quite a few food items as well as cosmetics (not just the dollar store stuff), has several different uses, and takes large quantities to really do any damage.
"It would be nearly impossible to reach toxic levels by consuming foods or supplements, which contain at most 1 g/kg of PG, except for alcoholic beverages in the US which are allowed 5 percent = 50g/kg" (https://en.wikipedia.org/wiki/Propylene_glycol#Safety_in_humans)
https://www.healthline.com/nutrition/propylene-glycol
That took me like 5 minutes of Googling. I'm not saying we shouldn't question what kinds of things are being put into our food and why but taking time to research and think about things is better than the sensationalist response of "OMG ANTIFREEZE IS LITERALLY BEING PUT INTO OUR FOOD". As far as the vanilla extract is concerned, real vanilla is expensive as fuck but it looks like this stuff can be used as an alternative (https://vanillaqueen.com/vanilla-extract-an-insiders-view/)