Being employed means that you have to share certain personal information with the company, like your birth date, your address, your social security number, etc.

Being employed means that you have to share certain personal information with the company, like your birth date, your address, your social security number, etc. But you don't expect the company to turn around and dox you to other employees. I'd argue that it was not the company's place to share this person's birth date with anyone, it was the company's place to keep private information private.