In undergrad I did physics so I used to tenuously be aware of this debate but I can't comment on the substance because I didn't go on to do my PhD in physics. But they're not colleagues in any meaningful sense. I don't ascribe any value to tenure or professorship but Woit is a "senior lecturer", which is basically an adjunct that's been around a long time, not a professor. For a long time his blog said he was the IT person for the department if I recall correctly. So Woit and his blog and lesswrong has absolutely always been more about click bait than substance to me. Greene isn't a paragon of scholarship either though - again, superficially, for many years now he's been a popsci celebrity rather than a real, actual, string theorist (much like Michio Kaku).