Colleagues speak badly, and I accidentally swear. Colleagues laughed at me. What should I do?

That's not a joke. Everyone has bad habits, even civilized people swear. This is not treating you like an outsider. They are releasing the pressure. Nowadays, people's lives are generally under great pressure. I have calculated that in our country, normal migrant workers can never afford to buy a house. Wages have gone up a little, but house prices have gone up several times, which is totally out of proportion. The pressure is great, so venting in front of you is a kind of trust, because everyone will pretend to be very lofty in front of others, and only when they are around themselves will they reveal their true self.

So are you.