Name the US president who never shook hands with anybody during his tenure, thinking it below his dignity.

George Washington famously believed shaking hands was beneath the dignity of the presidency and bowed instead instead, continuing a practice from his time as a gentleman of the 18th century. Abraham Lincoln, despite his formal demeanor, did shake hands at public receptions. Jimmy Carter and Harry Truman were 20th century presidents who had more informal styles and regularly shook hands.