take a part for the whole; generalize (about sth) from isolated incidents; over-generalize
We should not judge a person as totally worthless on the basis of his shortcomings.
The allegory mocks shortsighted people who mistake a part for the whole.
"Who said anything about logic?" he retorted. "An inference can be logical and still not be true. "
Firstly, admittedly, there are some college graduates who are not competent, but these students can not represent all the students.
Many people who say they are white found the menu 'funny, ' while others said it is just fuelling an unfair and untrue generalisation.