The phrase “watch your tone” is a typical idiom used to specific disapproval of somebody’s. It’s usually 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 acceptable for the scenario.
There are lots of the explanation why somebody is perhaps requested to “watch their tone.” Maybe they’re talking too loudly, or utilizing inappropriate language. Perhaps they’re being sarcastic or dismissive. Regardless of the purpose, you will need to concentrate on how your tone is being perceived and to make changes as wanted.