I believe some formatters have an option where you can specify a "do not reformat" block (or override formatting settings) via specific comments. As an exception, I'm okay with that. Most code (but I'm thinking business applications, not kernel drivers) benefits from default code formatting rules though.

And sometimes, if the code doesn't look good after automatic formatting, the code itself needs to be fixed. I'm specifically thinking about e.g. long or nested ternary statements; as soon as the auto formatter spreads it over multiple lines, you should probably refactor it.