My kid is the most unpicky eater on the planet. She has a few allergies but they don't really cause any issues....strawberries, and coconut. Other than that she pretty much eats everything. But she can't stand mushrooms. If they are chopped fine she is okay. But the texture makes her gag. She spent a few days with my sister who knows she hates mushrooms and my sister fed her mushrooms twice.
Now this kid eats brussel sprouts, spinach, greens, peas, carrots, beats, and pretty much every other veggie under the sun. She eats fish, pork, chicken, beef, lamb, and any other meat. She eats everything. But my sister forced her to eat mushrooms....TWICE....trying to get her to like them.