i don't care if you don't like me 如果你不喜欢我，我不介意 I don't care wht we have for dinner 晚饭吃什么，我无所谓 I don't care wht movie we see. 看什么电影，我无所谓

usually can be translated as“我不在乎 ; 我不管 ; 不关我的事 ; 我全不在意” I don't care if you don't like me. =〉I don't care if you don't like me.It's your business 如果你不喜欢我，我不在乎。那是你的事。 Whether you like me or not,I don't care. =〉Whether you like me or not,I don't care.It's your business 你喜不喜欢我，不关我的事。那是你的事。 I don't care wht we have for dinner. =〉I don't care wht we have for dinner. It’s up to you. 晚饭吃什么，我无所谓。你决定吧。 I don't care wht movie we see. =〉I don't care wht movie we see. It’s up to you. 看什么电影，我无所谓。你决定吧。 sometime it also can be translate into “随便” just as bear234 said. “随便” is more used in oral Chinese.It‘s more colloquial expression e.g. I don't care what you think. 我不在乎你怎么想。=随便你怎么想

无所谓（it's the most authentic translation)

if u use "I dont care" alone, it means: 随便 e.g.: 你想吃苹果还是橘子？（which do u want? apple or orange?） 随便。（I dont care.） for ur three examples, I dont care + something. we say: 我不 介意/关心 + something but if u want to speak chinese-style chinese... I don't care if you don't like me. 你喜欢不喜欢我随便（你）。 I don't care what we have for dinner. 晚餐吃什么随便（你）。 I don't care what movie we see. 看什么电影随便（你）。 if u add 你 for these phrases, it means u have no idea and u will follow "someone(你)" 's decide. for example, 我们吃什么？ what do we have? 随便你。 (it depends on u.) I dont care. also, if u want, u can add "你吃什么我吃什么" after 随便你。

Chinese people use another structure to say instead of "I don't care". It is something like " ... is ok"： ” （什么）。。。也好/都好“ 你不喜欢我也好： It's ok/nothing if you don't like me 晚饭吃什么都好： It's always ok for me with whatever we have for dinner 看什么电影都好: It doesn't matter me with any kind of films we see