Hi Adrian, I’m so sorry to hear what you’re going through.
Have you tried discussing what misophonia is with your parents (the science behind it, the research etc) and sharing articles with them to help them understand the condition?
From my own experience, people tend to get very defensive and upset if they’re told not to do something (e.g. told not to eat a certain way), especially when they feel they’re not doing anything wrong.
However, if they understand that you’re suffering from a neurological disorder and that this directly affects you, they’re more likely to be able to help.