'Persons educated through a foreign language are sure to be unpatriotic.' This statement is best described as

The sweeping claim that foreign-language education makes one unpatriotic is a prejudice.

It pronounces a fixed adverse judgement on a whole group in advance.

No evidence links the medium of instruction to loyalty to one's country.

The words 'sure to be' show a pre-formed bias, not a tested finding.

A hostile pre-judgement made without grounds is a prejudice.