Unreliable generalizations about all members of a group that do not take individual differences into account are known as

I believe the answer is: Stereotypes

Stereotypes tend to cause a prejudice that target a certain group of people.

Some examples of stereotypes are:
- Asians are bad at driving.
- Women on average tend to be less good at math compared to men.
- Gays have lower amount of testosterone.
- Southern people are devout and religious people.