Road rage ahole

I was stuck behind a car towing a horse box, so stuck around 50 entering a motorway, guy drives up my arse the whole of the slip road and makes a dangerous overtake of myself cutting up another driver and taking over the horse box, whilst he's clearly being a dick I flip him the bird... He loses it starts to block the horse box and go super slow then speeds off and loops a roundabout down the road to block me and proceeds to shout from his vehicle - I refuse to get out and signal him to just go. Kinda shit me up, whilst I maybe shouldn't swear at crap drivers what do you expect if you drive like an dangerous douchebag 🤷‍♂️