As a 20-something in the US, you're certainly very uninformed.
Gluten free, organic and anti-gmo have nothing to do with cargo cults and food fanatism.
Essentially nobody buys gluten-free products because they're gluten free (except who needs it). GF products are a very little minority, because the lack of gluten is a serious limitation in food preparation. Plus, such products are very expesive. Nobody turns "gluten-free" unless he has to.
Organic is part of a bigger cultural picture. In some countries, the majority of the people eat [much] organic. Nobody expects to become super fit and super healthy from it. It's just a choice judged to be healthier as a whole. It's actually the opposite of a cargo cult, since people who choose organic, do it for life, not to follow a fad who lasts a short time (which is essential to cargo culting).
And finally, it's not smart to bash anti-GMO just because smart people are supposed to be pro-GMO. There are also rational reasons for being anti-GMO and cretinic reasons for being pro-GMO (like assuming that the increased yield of a crop automatically implies economic convenience).
If Soylent is optimal and provides enjoyment, well, you better move to another country and try real food. Besides, in the bigger picture, Soylent carries the assumption that human nutrition is nothing else than intake of isolated nutritional elements, which is foolish.