It's OK, I re-balanced things earlier by asking a cyclist if he was "fcking stupid" after he filtered from his right-turn only lane into my straight-ahead only lane, on my offside at some high speed relative to traffic and inches between my bonnet and a traffic island. He was being an obnoxious prat in general perhaps as I had heard honking behind me but, I'd have been OK with an apology. You might imagine it wasn't forthcoming, instead I got a "fck off!".
With any luck, he fell off later that day and broke his legs. If not, I'm sure it's coming one day soon.