Juror eleven makes a suggestion that one of the others does not understand "reasonable doubt." to whom is he directing his remark, and why is the other juror angry?

Juror Eleven is telling that to Juror Seven. He was disrespected and offended because an immigrant tried to educate him on U.S legal system. He felt that immigrants should stay in their place and leave matters concerning the American legal system to citizens born in the country.