Nob on a bike

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I repeatedly drive a similar route for work/school run. There are two inevitable tailbacks (at least 10 minutes in each, every time, mostly stationary). One at a set of traffic lights, one before a very slow junction. A man on a bike clearly does the same route as I do. Every day, he rides up the side of each traffic jam, looking through all the drivers' windows... and when he sees someone on their phone, he'll bang on their window and gesticulate in a really sneery, condescending way. He wears a suit and just looks like he thinks he's the dog's bollocks. I don't use my phone in the queues, but tbh I wouldn't really judge someone for carefully glancing at theirs whilst in such a massive tailback.

I think this man is a nob and hypocrite (why aren't HIS eyes on the road, rather than looking through all the car windows?). DH says he's reasonable, and doing a public service. AIBU?

You know what, I don't reckon he WILL get thumped. And I think it's because (and this is a hunch based on many years of experience of aggressive men and on his sneery, superior demeanor) I don't think he'd do it to people who look like they might punch him.

Anyway, this has been interesting - thanks. I've taken onboard specific examples of how it can be dangerous to look away from the road even if your engine is shut down. I will still not do so myself (this has never been the issue).

I'm still not convinced this guy is motivated by keeping himself and others safe (I think he enjoys humiliating and bullying and aggressive banging on windows). And I don't think he's going about it the right way, even if he is... but I appreciate this is based on a judgement without ever having spoken with him.

Thanks again all