The people who say they need 3 cups of black coffee to start their day are just addicts with a high tolerance that experience mild withdrawal symptoms each morning.
If you feel like that, it’s your body crying for you to take a break.
If you like an occasional cup of coffee or energy drink to get through something, then that’s fine. But if you ever feel like one isn’t working like it used to, you should take a break from caffeine to reset your tolerance, not up the dosage like an addict.
Completely unnecessary, and you shouldn’t blame the other person because you didn’t understand their point.
Two cups of coffee is a significantly healthier choice than 2L of coca cola. That was obviously the point they were making. There’s no need to jump down their throat about it, and it’s telling that you jump to that over something relatively innocuous.