Yes I am, very irritated by (some) cyclists. Recently there was a cycling thread and it was obvious that the contributors were knowledgeable, experienced and extremely safety -conscious.
But so many of the people taking to their bikes at the moment are inexperienced, unfit and seem to think traffic laws simply don't apply to them, because there isn't so much traffic about. In the past few weeks I have seen all the following: riding on and off pavements without warning, weaving through traffic, going through red traffic lights, riding the wrong way down one-way streets, (3 different people) and last Friday, unbelievably, crossing the no-entry hatchings and cycling the wrong way round a traffic island. I did an emergency stop; she cycled on blithely, not even a helmet to protect her.
Very dangerous because so unpredictable. (Yes I know some motorists are too, but generally they are not so vulnerable; a cyclist is far more at risk if even touched by a car.)