For me it's kale, okra and escargot.
With kale, I couldn't get past the disgusting bitter taste. And, with both okra and escargot, I couldn't get past the texture.
To add, I also can't do field greens. A lot of places these days use field greens for their salads (even fast food places like Wendy's) and it's just gross to me. It's a mess of stuff that resembles what I could go pick out of my back yard. And that purple stuff? What the heck even is that???
Sorry, but when it comes to salads, I'll only eat iceberg, romaine or baby spinach.
How about y'all?