It’s always amusing to me to see this kind of argument. There’s plenty of things that are not illegal, like sexually harassing/nagging a woman verbally (without threats) for example, but is obviously ethically and socially problematic. I’m going to assume you already know that so either you mostly believe what OP is saying and know what this guy is doing is dubious at best or you find OP to be an unreliable narrator and is playing it up for points. Based on your other comment, it seems you’re just here to play the contrarian.

Maybe, but you’re losing fidelity by leaving out the part where he gets close to people and poses in such a way that seeing it is unavoidable. That’s distinct from him just picking a seat and chilling there. In a workplace scenario this assuredly would be sexual harassment.