This is actually the crucial question. The disorientation is an indication for a fundamental mismatch between the internal model established by the user and the presentation. It may be an issue of the flow of information (users are hesitant, because they realize at this point that this is not about what they thought it may be) or on the usability/design side of things (user has established an operational model, but this is not how it operates). Either way, there's a considerable dissonance, which will probably hurt the product: your presentation does not work for the user, you're not communicating on the same level, and this will be probably perceived as an issue of quality or even fitness for the purpose, maybe even intrigue. (Shouting at the user may provide a superficial fix, but will not address the potential damage.) – Which leads to the question: what is the actual problem and what caused it in the first place? (I'd argue, any serious attempt to operationalize this variable will inevitable lead you towards this much more serious issue. Operationalization is difficult for a reason. If you want tho have a controlled experiment, you must control all your variables – and the attempt to do so may hint you at deeper issues.)
BTW, there's also a potential danger in just taking the articulations of user dislike at face value: a classic trope in TV media research was audiences critizising the outfit of the presenter, while the real issue was a dissonance/mismatch in audio and visual presentation. Not that users could pinpoint this, hence, they would rather blame how the anchor was dressed…