The phrase “watch your tone” is a typical idiom used to specific disapproval of somebody’s. It’s sometimes used when somebody is being perceived as being impolite, disrespectful, or aggressive. When somebody tells you to “watch your tone,” they’re basically asking you to be extra aware of how you’re talking and to regulate your tone to be extra applicable for the scenario.
There are a lot of the reason why somebody may be requested to “watch their tone.” Maybe they’re talking too loudly, or utilizing inappropriate language. Possibly they’re being sarcastic or dismissive. Regardless of the motive, it is very important pay attention to how your tone is being perceived and to make changes as wanted.