Social skills arent always about being as literal as possible, they can also be about navigating social situations with as little friction as needed to inform others and achieve your goals.
Saying “no” to your boss and having them accept it would be ideal, but is generally unrealistic. Saying “I dont have time” or “im booked out” achieves the same goal that flat truth will not by making it look like you will negotiate when you wont.
I would argue saying anything except “No” is poor communication skills.
If you aren’t willing to negotiate then don’t give them anything to negotiate on.
Social skills arent always about being as literal as possible, they can also be about navigating social situations with as little friction as needed to inform others and achieve your goals.
Saying “no” to your boss and having them accept it would be ideal, but is generally unrealistic. Saying “I dont have time” or “im booked out” achieves the same goal that flat truth will not by making it look like you will negotiate when you wont.