Remaining calm and composed is crucial when dealing with a petty boss. Reacting emotionally can escalate the situation and may be used against you. Take deep breaths, stay patient, and try to keep your emotions in check.
Keep a detailed record of your interactions with your boss, especially instances where their pettiness affects your work or well-being. Document dates, times, specific comments, and actions. This record can be useful if you need to escalate the issue to HR or higher management.