Please report dangerous drivers to the police - Roadsafe. Report to plod, not just whinge here.

I find myself putting my hand out to tell them to give me a bit of space, but they take that as "fuckkkkk youuuuu"

This is all too common. An outstretched palm means back off, not up yours...
I think because many drivers feel invulnerable in their little boxes they don't realise how scary having a ton of metal baring down on you can be.