Is it time to start calling out bad cyclists?

I wanted to catch up with him to have a word about his socks, his crappy trackstand and why you no filter on the left bro

Because filtering on the left of a large vehicle is a very stupid thing to do. Filtering on the right is better practice all round - motorists are much more likely to be looking for trouble on their right shoulder than their left - and has the advantage that you avoid all the nodders filtering on the left.