Strong words, but you may have read too much into the post you reply to. The poster surely used the word 'disenfranchised' to describe people who feel they are not being listened to. A referendum gave them an opportunity to register their objection to being ignored or bypassed; a chance to say No to the status quo. For many of these people, so many of them deserving, the fact that the referendum was about the European Union was not especially important.
Patronising at the very least. You attribute false reasons and thoughts onto many people. Are you a mind reader or a chump?