To me whether or not someone is food-adventurous says a LOT about their personality.
It takes multiple exposures to a food for your taste buds to develop. I'm sorry, I love living here, but I do think that the Argentine palate is very underdeveloped. Although I should correct myself -- it's not all of Argentina, it is BA specifically. In the North they do have foods that in BA would be considered as spicy as a Vindaloo curry (HAHAHA).
I was the pickiest eater growing up. I hated everything. Every night was a battle with my mum. Every night she'd make me have 5 bites of whatever food I was refusing. 5 bites and then I was allowed to leave the table (this meant many nights of me sitting alone at the table after everyone had left and my mum was cleaning up the kitchen).
My friend on the other hand had a mum who thought that no one should be forced to try anything they don't like. So if she refused to eat something just because it looked funny (forget about tasting it), that was it, she didn't have to.
Today, I will eat and try anything. I love all variety of foods and the few things I don't like are usually related to achurras (kidneys, chinculinos). My friend? She won't eat anything that even looks slightly "odd" to her.
Portenos are like my friend -- if it is something they don't recognise, something that looks a bit odd, the large majority will just refuse to try it. I fortunately have found myself an Argentine that will try anything, and he even likes spice! If he weren't food-adventurous, things probably never would have worked out between us.