Fyi, because I'm not a dick, they're making fun of you because "suburbs" of Portland are pretty residential. Portland itself looks more like a suburb than a city to people who are from a city. Also, you should ask this in r/portlandme instead. Realize that many of the rural folk lurk here rather than there and so you will get snarky responses to things like your dietary restrictions as gluten-free could be seen as a hippy "fad-diet" (though that may not be the case for you). Best bet is probably this though: https://www.findmeglutenfree.com