The term BE RUDE TO can be broken down into three crossword solutions: SASS (4 letters), SHOVE (5 letters), and INSOLENT (8 letters). SASS is defined as to speak or act impudently or disrespectfully, while SHOVE means to push roughly. INSOLENT is defined as showing a rude and arrogant lack of respect. Therefore, BE RUDE TO can be interpreted as speaking or acting in an impudent or disrespectful manner, pushing roughly, or showing a lack of respect in a rude and arrogant way.