I had a run in with someone matching that description a few weeks back heading up Brixton Hill. Barging up ringing his bell as we were slowing for the lights because he felt I had closed his gap. Then side swiped another cyclist who was "too far out".
"But crucially no tall dutchmen on eMoofs tried to cause an accident to make a point... so swings and roundabouts eh."
Travelling through Brixton by any chance?