if you don't mind me saying/asking idiom
（用于礼貌地提出批评）如果你不介意我说
used in order to be more polite when you say something that could slightly upset, annoy, or embarrass someone
If you don't mind me saying (so), I think the soup needs a little more salt. 如果你不介意的话，我认为汤里需要多加点盐。
Do you have a boyfriend, if you don't mind me asking? 如果你不介意我问的话，你有男朋友吗？