I used to have a 'bad mouth' before having DS but since then I have tried to tone it down as much as I can. I do say the occasional 'shit'.
DH on the other side, will say fuck if he drops a full glass of milk, or bangs his head on a cupboard, or similar
DS is starting to feel bad about it. He is constantly reminded in school that those are bad words etc, and I guess he does not like it that his dad says them?
I have briefly mentioned it to DH and he says he cannot stop it. That they are 'just words' that come out when he is annoyed, and that they are not really important.
English is not our first language so it is true that swearing in English has less meaning and connotation, but still it makes me worry that DS seems to be reacting to it.