Please analyze the tweet "@Rocks_n_Ropes Can't believe how rude your cashier was today when I was returning an item!  Your customer service is slacking. #terrible" and classify its emotional content. Choose from the following emotions: anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust. If no emotions are detected, respond with "neutral or no emotion".
anger, disgust