Nobody's saying that this guy is preying. But the fact that other guys prey makes unusual behavior like this more suspect. Women have to be more careful than guys, since they are more likely to be abused. So naturally, they are more sensitive to unusual behavior. You and I see this spreadsheet and think "this dude's just awkward, but probably harmless." But some women might think "serial killer alert." This is partly because of the media (watch enough dateline and you'll think every man's a kidnapper). But partly because of reality - some men do sick shit, and women are scared. My wife has some stories about past dates she's been on that would repulse you.