I've created some congratulatory phrases with a hint of sarcasm that might be used as a subtle way to deal with a cocky coworker. Use with caution, and remember to maintain a professional tone. 1. “I wish you success in your upcoming projects, and I’m sure your…impressive self-confidence will lead to good results.” 2. “I’m glad that you are so confident in your abilities. We can all learn from your…enthusiasm.” 3. “I’m so glad to hear that you’ve been promoted. You’ll certainly…listen attentively to your team members and consider their suggestions.” 4. “I wish you continued advancement in your career. I’m sure your…amazing abilities will serve you well in any new challenge.” 5. “I respect your willingness to always jump into challenging new projects. Your…willingness to take calculated risks is truly admirable.” 6. “I appreciate your…unique perspective. This will definitely make our team’s brainstorming sessions more…interesting.” 7. “Your dedication and work ethic are truly admirable, and I’m sure your…approach with a strong emphasis on individual achievement will lead to success.” 8. “I’m so glad to hear that you won that big contract. Your…excellent negotiation skills must have played a crucial role.” Remember to maintain a neutral tone and avoid outright hostility, which can hurt your colleagues’ feelings or damage working relationships. These sentences are designed to show the arrogance of colleagues in a slightly subtle way without being offensive.