Funny you should say that; I went to Florence some years back and we took a day trip to Pisa and had to deal with the worst, most aggressive scammers I’ve ever experienced.
We may have just gotten lucky. I also had a great time in Venice once by wandering off randomly and ending up somewhere I can only assume tourists don’t normally go. We bought some fruit off a boat which was both delicious and very affordable, so I assume the target demographic was not tourists. I’m pretty sure that’s not the universal experience of Venice either.