@replacement swears
They're a big pet peeve for me. You don't have to swear. It's very, very easy to not swear. But you know, you can just not say sentences that require swearing. You don't have to act like you're going to swear and then substitute another word for it. Just don't require it in the first place.
People voluntarily putting censorship and bleeping in their work (youtube mostly) bothers me more. I can understand to a point on live recorded stuff (though really, if you can't record anything live without swearing then maybe you shouldn't be trying to make family friendly videos that way). But on scripted things you can just not write swearing into your script.
People with problems with swearing don't seem to understand what swearing -is-. The word ... Doesn't matter. At all. Swearing is in the intent. I could call you a knuckle-licking horse rider and you should be just as offended, if I had called you a cock-sucking maggot. Because either way, I'm expressing displeasure and anger at you, and want you to know, as well as disrespecting you.
Words can't hurt you, they can never hurt you, but people who say "sticks and stone" don't realize that while words can't hurt, it's never been the words that have been doing the harm, but the intent behind them. Knowing that someone disrespects, and even hates you, like that is what does the hurting, not the words they use.
Edit: Of course, it still works with non-offending swearing, like to express pain or frustration or to decorate your sentences. It's still not the words that matter, but the intent. Of course, with sentence-decoration, having words that OTHER people also see as sentence-decorators helps, because it's not really decoration if they don't recognize it as such. :v