I'm not that old but even in the last 15 years or so I've noticed that the fuck-word has become a lot less taboo. Even people I know who don't swear very much I've heard use it, granted very sparingly, but they wouldn't have used it at all a fewyears ago. Kids are picking up swearwords casually earlier than my peers did.

My hypothesis, I think I big part of the change is YouTube personalities. A ton of the biggest YouTubers, especially the gamers, have sailor mouths. Gen z and later grew up with "let's fuckin go" and shit like that, and I think that that casualness is bleeding into older generations too.