I'd use a horn. Swearing and shouting is natural, but it can also lose you concentration. Also that the motorcyclist blasting past you when the lights changed (around 0:08).. had you wobbled there would have almost certainly been a collision and it would have been their fault.
Tip: Report him to the police for a suspected "hate crime" and I can guarantee you'll get a response. Why? Because they are told to prioritize these reports and are always going on and on about how they won't tolerate hate etc etc. This is the system Parliament created - this is the system they get.
Any failure to respond to your complain (record all calls and keep all correspondence ) should also be met with a complaint which you should then, if need be, take to a higher level. If the driver of that vehicle wants to act like some moron from an overseas slum-hole then that's his problem not your's and he has no right to be racist.
Shouldnt be using your phone when driving or in control of a motor vehicle anyway.