Yes, drinking too much iced black tea will cause you to get angry because it contains more sugar.

Bottled iced tea and other beverages contain a lot of preservatives and additives. If used in large amounts every day, they may increase the chance of tooth decay, lead to obesity, poor diet, etc. For these beverages, the best advice is It is best to try to avoid excessive consumption for a long time. You can drink some boiled water or fruit juice instead, or you can make your own iced black tea.