Is it time to start calling out bad cyclists?

Has anyone else noticed the amount of people that veer off the road when going through a junction. For example, crossroads with a yellow box, sitting waiting at lights, when the lights go green, you should go straight ahead. But no, an alarming amount of people set off then veer to the left, even going out of the box then back in again before exiting the junction. Is this the magnetic kerb effect do you think?

This is where confidence comes in. They obviously think they're being courteous to other drivers by giving them space because they're probably slow starters. A bit like those idiots who think it's clever to pull back left as quickly and sharply as possible after they've overtaken. They feel under pressure that they are slowing the cars down, as they can't accelerate quickly they do that. It's very dangerous and is even more annoying for drivers because it makes you unpredictable. Are you turning? Or just being a cunt?