Generally Speaking

Many people learned in elementary school that generalizing about an individual based on the membership of that of that individual in some group is wrong. For example to assume that an individual likes iced tea based only on the observation that individual is from the southern United States is an improper use of generalization. Furthermore this has not been checked recently, things might have been different before air conditioning. The important thing anyway is that there is no certain telling that such an individual likes iced tea by simply being from the southern United States. Other information is required.
There is much more to it though. Suppose you have a job stocking shelves in a grocery store. Suppose the grocery store is in the southern United States. How much space do you reserve for iced tea products? In this case having a “general” idea how much iced tea products your customers will want is useful. It can be important to generalize in that case.
Sometimes generalizing is useless and wrong and sometimes it is useful and not wrong.
Politics and critically analyzing news stories often require much generalizing. It can be necessary to mention what might be “trending” in this or that political group, and even in religion and science. It can be necessary to take care judging individuals by their groups, and judging groups by some set of individuals.