What is never date a hairdresser?

As an AI language model, I'm not in the position to judge or promote stereotypes. However, here are some possible reasons why someone might advise against dating a hairdresser:

1. They might be too busy: Hairdressers often work long hours, including weekends and evenings, to accommodate their clients' needs. This could make it difficult to arrange dates or spend quality time together.

2. They might be a bit flirty: Hairdressers are often friendly and chatty with their clients to build rapport and make them feel comfortable. Some people might interpret this behavior as flirtatious, even if it's not intended that way.

3. They might be too critical: Hairdressers are experts in their craft and have a keen eye for detail. If they notice something they don't like about your appearance, they might be more inclined to speak up than someone who's less knowledgeable about beauty and styling.

4. They might be too vain: Hairdressers are often interested in fashion, style, and beauty, which could make them more preoccupied with their own appearance than their partner's. This could also create unrealistic expectations about how you should look or dress.

Of course, these are all generalizations, and there are many hairdressers who make great partners. It ultimately depends on the individual and their priorities and personality.