As a barista, there are several things that coffee professionals tend to avoid. Here are some things that baristas might consider to be unfavorable:

1. Dirty equipment: Baristas typically prioritize cleanliness and hygiene. They frequently clean their equipment to ensure consistent and high-quality coffee.
2. Stale coffee beans: Using old or expired coffee beans can result in a less flavorful cup of coffee. Baristas usually aim to use freshly roasted beans.
3. Improper storage of coffee beans: Coffee beans should be stored in airtight containers away from heat, light, and moisture. Poor storage can lead to flavor deterioration.
4. Inconsistent brewing techniques: Baristas strive for consistency in their brewing methods to provide reliable and repeatable coffee experiences.
5. Untrained or inexperienced staff: Baristas prefer to work with trained and knowledgeable colleagues who can ensure proper coffee preparation and service.
6. Wasting coffee: Coffee wastage is discouraged, as every bean is valued. Baristas employ techniques to minimize waste, such as measuring ingredients accurately.
7. Ignoring customer preferences: Baristas prioritize customer satisfaction and tend to avoid disregarding or neglecting their preferences when making coffee.
8. Poor customer service: Baristas understand the importance of providing excellent customer service by being attentive, friendly, and knowledgeable about their products.
9. Using low-quality ingredients: Using subpar milk, sweeteners, or other ingredients can affect the overall taste and quality of a coffee beverage.
10. Inadequate cleanliness and hygiene: Baristas pay attention to personal hygiene, keeping their hands clean and following sanitary practices to avoid any contamination.

These are just some examples, and individual baristas may have additional things that they personally avoid.