Once in my life I used a lot of swear words. Depending on the company. It wasn't something I was really aware of. How bad it could be. I knew I more or less stopped using them while talking with certain people or in certain situations. But when a friend, that was no stranger to cursing, told me he didn't like to talk to me on the bus since every other word I used was to use swear words. So I decided to stop. Took me a good while, months before seeing any real improvement but I managed. Since I often talk straight out without thinking it wasn't like I could stop myself before swearing so I punished myself by digging my nails into my hand and twist as hard as I could. Trust me, if you do it right it hurts a lot. I got a bit worried the times I started to bleed though.
I wouldn't say that I never swear. It happens but it's very rare. Not like it happens once a week or anything.
Can I be offended by swearing? Oh yes. But it depends on who says it, why, where and what kind of situation. So it's not like I'm offended everytime I hear a swear word. I think it can depend on my mood as well. Sometimes I probably don't even think about it when I hear it but when I do sometimes it's easier to ignore and sometimes it gets me.
I can see situations when a swear word adds something to what's being said but honestly most of the times I just think it sounds bad. I'm glad that I managed to stop when I did. I'd be very ashamed if I still talked the same way with friends.
But there's so many ways to say things with or without swear words that I'd have a problem with so I wouldn't single out cursing to be the main problem.