If someone goes through the effort of preparing food for you as a guest at a dinner party or a family event, even if you absolutely hate the foods on your plate, it takes a certain personality to speak up and say, "I actually don't like this." If you have an allergy or severe aversion you might get a pass for leaving your plate untouched, but most people would rather suffer in silence then risk offending someone who very kindly shared their food with us. Cooking and serving food brings people together and it is much more than just necessary nourishment for our bodies to function. Food is a key part of culture and celebration-refusing something someone has given you to eat is more than just awkward, it's rude.
So, when a recent Reddit user asked, "What's the nastiest thing you've ever eaten out of courtesy?" people were ready to share the foods they've swallowed in order to mind their manners.