When confronted with an unwanted behavior, it is important to look at what the behavior represents and what it accomplishes. As Huntington's disease advances the ability to communicate diminishes, First there is slowing in the production of words. As words become more sparse, the content is still there, sometime stripped of pronouns and adjectives. Eventually the person may not be able to use speech to communicate. It is at this point that many obnoxious behaviors occur.
Lets face it, canned peas taste pretty bad.
Maybe they would like fresh peas instead. In this case the behavior can convey many different meanings. Solving the behavior for the meaning can eliminate the problem. Remember that someone with Huntington's disease is still a person. They may not be the same as they were several years ago, but they deserve to be treated with respect and understanding to help preserve the quality and dignity of their life.