Yeah, they have a point. This is more to do with the economic situation, AirBnB/high rents/digital nomads etc rather than the antisocial behaviour (although that isn't welcome either). It's not all due to foreigners though, but that is one part of the picture. Either way, there is a big situation to be addressed and has progressed these past few years.
And yes, a little respect when visiting a place and fitting in as best possible is a good idea… basic manners and paying your bills is a start!