I am so with you on ^this! I have always disliked mushrooms. I think it's mostly the texture, but the appearance and flavour also put me off.
One time I was travelling in France and was invited to dinner with a family. One of the side dishes was a local delicacy (called 'Cepe de Bordeaux'). The whole family was talking it up like it was a very rare and special dish for them to serve, and as the guest, the father served me the biggest amount. Everyone around the table watched me like it was some sort of ritual. I just didn't know how to tell them I hate mushrooms, so I gritted my teeth, and somehow chugged it all down without gagging. It had the appearance and consistency of a pile of snot. Yuck.
Thank fuck the French have bread and wine in abundance at meal times, that saved me!
What I hadn't anticipated though, was that seeing me eat the mushrooms so quickly made them think I really enjoyed them, and next thing, the father had put another huge spoonful on my plate. I just don't know how I didn't vomit, but somehow ate them (very slowly this time) and moved on to potatos, meat and 'proper' food