It is the latest in a long line of revelations in which men’s hairstyles have been blamed for the sexist treatment of women.
It comes as the National Organization for Women’s president, Gail Dines, said she would support a federal bill to ban the practice of sex-segregated hair in the US.
“When women do have hair, they’re the ones with hair,” Ms Dines said on a conference call with US news outlets.
“I think that if there’s a right to it, the right to hair should be available to everyone, regardless of whether or not they have hair.”
In recent years, a growing number of US hairdos have been deemed to be sexist by industry insiders, with hair that has been styled with straight or curly hair being branded as sexist.
In January, US beauty brand Nail Spa Inc said it would stop selling its products that included hair in a style that was deemed “not appropriate”.
But the US National Association of Realtors said the decision to ban its hair styles in the country was motivated by a growing body of research on the subject.
In March, the US government published its own study which found the number of hairdryers was falling nationwide, with women making up a growing proportion of the workforce.
A year later, the National Institute for Occupational Safety and Health released a report which found that the majority of men had hair on their heads, and most women had hair over their shoulders.
The study said that “the majority of American men who work as hairdresses also have hair on the sides of their heads and some have hair over the shoulder.”
A month later, a similar study by the same group found that a “small minority” of American hairdlers reported “gender-based discrimination”.
“The most prevalent and prevalent form of gender-based hair discrimination is hair styling, which occurs when hairstyles and styling methods are perceived to be more ‘masculine’ than ‘feminine’ and men’s styles are judged to be ‘more feminine’,” the study said.
The survey found that, while hair stylists in the United States were mostly white, African American and Asian American women made up “a significant proportion” of those surveyed, and were often treated as less competent, and less “professional” by other hair stylist workers.
Women were also more likely to be told to stop styling their hair and stop wearing accessories such as earrings or bracelets.
“This is the result of male stylists using women as extensions of themselves,” the report said.
“In the same way that we’re seeing male hair stylizers treating women as tools, we’re also seeing male hairstylists using men as extensions to their own hair styles.”
But, the NNA said, the issue of hair styling was “not a new phenomenon”.
The group has been working with industry to educate consumers and companies about the issue.
The NNA’s CEO, Karen Deacon, said the group was working with companies to “educate and educate” consumers about hair styling.
“We’re trying to make sure that we are teaching people that the most important thing about hair is its natural beauty, not the way it looks,” she said.