Why should a bartender avoid allowing a beer faucet to touch the glass?

Allowing a beer faucet to come into contact with the glass can indeed lead to the transfer of microorganisms, which may compromise the cleanliness of the glass and the quality of the beer being served. This contact can introduce bacteria, yeast, or other contaminants from the faucet onto the drinking surface, potentially causing spoilage or an off taste in the beer. Maintaining proper sanitation is crucial in any beverage service environment, and this practice helps ensure that the beer retains its intended flavor and quality.

While spillage, carbonation, and flavor profile are important considerations in pouring beer, they are secondary to the primary concern of hygiene and the prevention of contamination. Good pouring techniques that keep the faucet away from the glass help ensure both the integrity of the beer and the health of the patrons.