Pigeon holing

to classify or categorize, esp. in a rigid manner, to treat or classify according to a mental stereotype

    
to put somebody in a pigeon-hole - cataloguer quelqu'un  

• Because I had an unusual accent people were not able to put me into a pigeon-hole.
• He felt they had pigeonholed him ...        

to be pigeonholed as sth - être catalogué comme quelque chose 

• I don't want to be pigeonholed as a kids' presenter.