tar with the same brush

tar somebody with the same brush

to believe wrongly that someone or something has the same bad qualities as someone or something that is similar (usually passive) I admit that some football supporters do cause trouble but it's not fair that we're all being tarred with the same brush.
See also: brush, same, tar
References in periodicals archive ?
and for that reason, justly or not, those who have not milked the system are tar with the same brush as the pigs in the trough.
I do not give much credence to percentages, and note your attempt, however unconscious, to tar with the same brush all the other towns and cities mentioned.