Tri / Triathlon / Triathlons - do they float your boat?

Why does swimming make people so unaware? I feel like I get crazy swim rage but then I think how can people really be so stupid? Every time I swim inside I feel like there's another example of someone being blissfully unaware of how annoying they're being. It doesn't help that all the lifeguards at our pool are teenagers who won't interact or step in until it's literally life threatening.