There is nothing scientific about it. When I am playing this (or any of the other tune on my 'banned' list), my self talk is telling me that this is not what I took up the bass for, that its is predictable, repetitive, tedious and cringeworthy and that I hate it and everything it stands for. If my self talk was doing that about a book I was reading, I would stop reading it. If it was telling me that about a film I was watching, some food I was eating or a conversation I was having, I would turn it off, put my knife and fork down and engineer my removal from that situation. Mustang Sally is no different. The only reason I would continue doing it is for money and that is what I have a day job for. It is the musical equivalent of a comedian saying 'when is a door not a door? When it is ajar'.
PS I am a frightful snob.