i think you're going to hear a lot of the inevitable "corn is not a vegetable, it's a grain" and "it's starchy and loaded with sugar". there are other problems with corn as well, like how almost all commerical corn you buy is now GMO...but is it toxic? probably not. it's definitely not like gluten grains, so overall i think overall corn is pretty benign.
that being said...you're only eating it once a week. you're preparing it yourself, it's not like you're buying that nasty microwave crap. the rest of your diet is golden. so why obsess over something so small? if you enjoy eating it, then eat it! micro-managing your diet to the point where you are debating cutting out something you obviously look forward to every weekend seems counterintuitive to what i have learned about the primal lifestyle.
but that's just my $.02