When is it a bad day? After you've lost money? If your car breaks down and then you make money that day, is it a bad day then? "Bad day" is not quantifiable.
If bad day means a day when you can't think and judge clearly; then the answer is yes. Clarity of mind is paramount.
You are not in this business to have bad days. But if so, stop. Do the study and revision to get your trading model right.
True or False...if you have a "bad" day at trading should you jump out of a window? Is there some sort of disconnect in the managment of emotions both directions?