Is it disrespectful for girls to show their toes in public with sandals?

It is ok for girls to wear sandals barefoot on formal occasions. Sandals are cool in nature, and barefoot conforms to this feature, but it needs to be emphasized that only women can. For example, in our company, girls wear sandals, shorts, short skirts and collarless vests barefoot. But boys must not, boys must wear more.