I agree... looking is something that deserves investigating. For example, I had a coworker who had a habit of reading people's screens from behind - what news

I agree... looking is something that deserves investigating. For example, I had a coworker who had a habit of reading people's screens from behind - what news website article you were reading, or email, or whatever. He was just a nosy person with no sense of other people's personal space. It was definitely offputting and annoying, and felt like an invasion of my privacy. Still, I wouldn't consider this something he should be fired over - more like something a superior should have raised & discouraged. Reading the comment felt more like that, rather than a hostile workplace thing that warrants immediate firing without an investigation.