As a person with trashy neighbours who think they own the street, study how they talk to each other when they want something done then talk to them like that.
I tried being civil with my neighbours, but nothing, then one day I had a shitty day and had enough, walked to the edge of my drive, looked directly at their house and screamed " GET YOUR FUCKING SHIT OFF MY SIDE OF THE STREET OR ILL MOVE IT INTO THE FUCKING RIVER!" walked back inside and about 30 minutes later everything was moved, they behave most the time now, but whenever they try shit again I just do the same thing.
If they're also really loud and you can hear general conversations, make sure to repeat something they know they've said, let's them know you know more about them then they do about you.
This picture has been around since at least 2017 and DALL-E came out around 2021. It's jpg compression from years of reposts.