From Pew Research:

Declining share of Americans view respectful political debates as very important. Slightly more than half of adults (54%) say it is very important that the tone of political debate is respectful, down from 61% two years ago. The shift has come about equally among Republicans and Democrats. Few people in either party (30% of Republicans, 24% of Democrats) think this description – the tone of political debates is respectful – describes the country well.