Is it time to start calling out bad cyclists?

I saw two guys on single speed FREEWHEEL with only the front brake, one today whom I nearly crashed into because he jumped out from the pavement without looking, and one from yesterday whom I couldn't overtake despite many attempts because he was wobbling all the way. Is this a new trend? Wobbling on a freewheel with only a front brake?

^theres a guy that ride a black create with just a front brake, single speed, running something like 42x18, spins like mad through every red down holloway road in the morning, not sure he actually knows how to ride a bike

polo.