This is a thoughtful response to your feelings about the event in your adopted town.
I do love food festivals of ALL kinds. So, I would have looked into this one, myself. One glance at kitsch, and I would have skipped.
Do you have taco places you would recommend in your city? Perhaps, a “Taco Crawl” that residents might be able to walk and eat at several terrific Mexican heritage kinds of places? I bet if you shared that with your community, as an alternative to this festival, you’d get one heck of a response.
People don’t wake up each day wanting to be jerks, sometimes they just need shown a way not to be.