There used to be a bloke near us who went around the streets shouting at everyone. This included traffic, which he'd sometimes direct with exaggerated arm gestures, whilst swearing volubly.
His name was Fred, and he was something of a local fixture. No one bothered him, although he once had a confrontation with a bin lorry, during which he stuck out his leg and dared them to drive over his foot.
They duly obliged, causing something of a stink, and the next time I saw and heard him, his foot was in plaster, but he was still ranting, raving, and gesturing.
Bob is much the same. Bear that in mind when he comes back, and come back he will. He's noisy, but harmless. You just need to join in with the joke.