Hello!
Statements including "always," "everybody," and "never" are examples of overgeneralizations.
For example, if the topic of a person's essay is vegetarianism, he cannot say "Vegetables always taste better than meat." This is because many people may disagree with the statement that vegetables taste better than meat. The statement is overgeneralized because it is extremely broad and not all people may agree with it.
I hope this helps you! Have a good day!