Is it time to start calling out bad cyclists?

Very interesting. I just came here to say, I think Im out of the game. I upset this guy on Southwark Street last week. (he was a total bedwetter TBH). He did that thing of over shooting the stop lines and stopped exactly on the ped crossing and there wasn't a lot of space for crossing anyway. A few other cyclists turned up so I didn't wanna say anything then and waited until things spread out.
He just flipped out in no time screaming at me to fuck off and that I'd cause him to have an accident.
I didn't swear at him, threaten him, or belittle him. Just tried to engage in conversation. If that's the case then I'm out. I don't want anyone turned off cycling. But if anyone knows whom this guys is (Northern Irish, I think, with dark hair) apologise on my behalf. I was never looking to cause that amount of hurt to him but he does need a serious dose of HTFU.

I've noticed this recently also- the "do you want me to have an accident?! DO YOU WANT TO MAKE ME HAVE AN ACCIDENT?!" from people who I've asked not to push other cyclists aside to get to the front/over the line well ahead of where "front" is.

I cycled along Whitehall trying to explain to the chap that forcing his way past everyone else was not making him safer than waiting patiently in turn, but he just wasn't accepting it.