Hi,gretanz ,thank you ,and thank you all.

I think the very simple and correct expressions you can use as the followings: Forget it!/skip it!/I don’t wanna talk about this any more.

It really depends if you are genuinely angry at this person or just want to express that you want to forget about this matter. For example number 1 and 4 could be construed as being a bit rude or terse. These are grammatically correct: 1) Please don't say that again. 2) Must you remind me of it? 3) I don't want to recall that please. 4) Shut up! Let me forget about it. The best and most often used translation of 别提了 would be "Don't remind me" - this is quite casual and what you would say to friends. E.g. If you have an exam tomorrow and you haven't prepared.Your friend asks you: "Don't you have an exam tomorrow?" You can reply: "Don't remind me!" 加油吧！

"Would you please stop saying that?" "Do you have to remind me that?" "Stop saying that, will you?" "Why don't you just shut up, I'm trying to forget about it." "How can I forget if you go on talking about that?" I would say "La la la la I'm not listening to you."