What is the experience of nonstandard Mandarin?

I think that if Mandarin is not standard, it will sometimes be embarrassing, but what I want to express is incomprehensible to others because of problems such as nonstandard or even accent, and it is always confusing. Like two people's embarrassed smirking, you will make a lot of jokes, just like Zhen Ji: Sometimes you really can't tell the near sounds of Mandarin, F and H, and then you can't read the words around your mouth together, which is particularly difficult!