Generally you only get frowned at if you're not using type hints while contributing to a project whose coding standards say "we use type hints here."

If you're working on a project that doesn't use type hints, there's also plenty of frowning, but that's just because coding without a type checker is kind of painful.

> Generally you only get frowned at if you're not using type hints while contributing to a project whose coding standards say "we use type hints here."

Yeah, that obviously makes sense, not following the code guidelines of a project should be frowned upon.