Is it time to start calling out bad cyclists?

I gave a little toot on horn to make a point and the riders towards the back decided to flick the Vs at me as though I had done something wrong.

you: i used the horn to make a point

highway code:
112

The horn. Use only while your vehicle is moving and you need to warn other road users of your presence. Never sound your horn aggressively.
(http://www.direct.gov.uk/en/TravelAndTransport/Highwaycode/DG_070289)

so maybe he flicked the vs at you as if you had done something wrong because you did do something wrong

also that RED find made me do a big lol