There is a difference- I hope- between a quick tap on the horn when 50 ft back from a bike and a blast when they are right behind you. But to be honest- My quick tap to a cyclist to warn him I am coming does not always work. Then they deserve a noisier reminder that they are not the only ones on the road. Doesn't happen often but I do wish that cyclists would realise they do not make good mascots on the front of cars- and trucks- and buses.