I'll try anything and haven't come across much that I don't like. The only thing I can think of currently is calamari. I've tried it a handful of times and don't hate it but would politely decline it. This is a relatively recent development though. I was a real picky eater when I was a teenager. I wouldn't eat salads or most vegetables, and wouldn't go near any foreign foods. I'm kinda glad I was like that early in life though. It's made my twenties a really enjoyable experience of trying new things and finding foods that I absolutely love.
Oh, and for you mustard haters: I will occasionally eat a mustard sandwich. Like, maybe, once every couple months. Two slices of bread, mustard, that's it. It's a weird thing I've done my whole life.
I just really love mustard you guys.