You have two tactics, both of which will work but over different time frames. The quickest way to get it to stop is to ignore it. However, "quick" might mean a couple of weeks. I really do not like to go this route myself. But we are less bothered by it than you seem to be. My dd has experimented with swear words and will rudely "shhhhh" me if I dare to speak when she is on her play phone. But I have come to realize that she learns that stuff somewhere.....probably from us or others that she is close to so ignoring it seems just as rude as the original behavior. What we do is play around with the words, talk about them, explain how they make people feel, explain our own weaknesses in word choices, etc..... This of course takes much more time but I think it is more effective in the long run. I want dd to understand the words and not necessarily feel shame around them. Sometimes "shut up" has it's place IMO so I would not necessarily want to erradicate it. In your case, I would probably play with the phrase to keep it a little light. Like when she yells it, start goofing around and get louder and louder which will probably escalate the phrase into silliness. Or say "oh yeah?, well YOU open down!!!!" But then, out of the heat of the moment start having discussions about words people use and how maybe they shouldn't because someone's feelings might be hurt. At 20 months she will not really understand it but she will probably get the idea that discretion should be used around those words and to look to you for cues about appropriate use.
IMO, with swear words and such, ignoring or punishing will probably result in the child obeying at home and in front of adults but might have a potty mouth on the playground. More gentle guiding might not prevent use of the words at home all of the time but more correct use and more consideration for feelings and how it makes them look/feel. Both have thier drawbacks.
IMO, with swear words and such, ignoring or punishing will probably result in the child obeying at home and in front of adults but might have a potty mouth on the playground. More gentle guiding might not prevent use of the words at home all of the time but more correct use and more consideration for feelings and how it makes them look/feel. Both have thier drawbacks.