tar someone with the same brush
US /tɑr ˈsʌm.wʌn wɪð ðə seɪm brʌʃ/
UK /tɑr ˈsʌm.wʌn wɪð ðə seɪm brʌʃ/

1.
meter en el mismo saco, juzgar con la misma vara
to unfairly criticize someone by associating them with a group that is disliked or has a bad reputation, even if they do not deserve it
:
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It's unfair to tar all politicians with the same brush; some are genuinely trying to make a difference.
Es injusto meter a todos los políticos en el mismo saco; algunos realmente están tratando de hacer una diferencia.
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Just because a few students cheated doesn't mean you should tar the whole class with the same brush.
El hecho de que algunos estudiantes hicieran trampa no significa que debas meter a toda la clase en el mismo saco.