Is there a legitimate reference indicating tourists are being blamed for spread that can be shared here, or is this conjecture? Outside of Bonaire, I’ve not seen enough contact tracing to confirm anything like this.
As far as "feared", it makes sense that tourists would be feared especially if they aren’t following the rules and are traveling from areas with higher infection rates. It says a lot that potential tourists even ask about "mask protocols". It’s a global pandemic. Everyone should be following all the CDC recommended precautions everywhere, even if they refuse to believe the simple science of why.
ETA: it does make sense to ask about protocols if there is a concern there may not be any.
Locals in tourist areas have a very strong incentive to implement and follow protocols - they want the tourists to feel that it is safe to visit, so it’s easy to understand why infection rates would be lower. I would propose that poor and inner city areas of Mexico and the US have higher infection rates because of high population density, low availability of PPE and poor medical care.