She refused to share his contempt, and 50 years ago became the first woman to run the Boston Marathon.
Among women, former Ducks runner and Beaverton resident Jordan Hasay finished third in her marathon debut with an unofficial time of 2 hours, 23 minutes, behind victor Edna Kiplagat, a Kenyan policewoman running her first Boston Marathon, and second-place finisher Rose Chelimo of Bahrain.
Kirui, 24, produced a devastating sprint with four miles to go to settle an enthralling tactical battle with American rival Galen Rupp, the 2016 Olympic bronze medallist.
As Switzer runs the 121st Boston Marathon on Monday, she'll be wearing the same number she wore during her historic race in 1967.
Kathrine Switzer, who in 1967 became the first woman to ever complete the Boston Marathon, will be running in the race again this year.
This was the third year that Downes, who lost his leg in the 2013 attacks, competed in the race in the handcycle division, having also done so in 2014 and 2015.
The winners' times are considered a world best and not a world record. "Heaven forbid, if something happened, my guys were sort of shadowing me along the course in their vehicle. Not easy", Kirui said.
"I have it hidden in my house", Switzer said.
"I tried to push more, hard and I saw my [rivals] were not picking up the pace".
Police Commissioner William Evans returned to the storied marathon for the first time as a runner Monday.
Kenyan policewoman Edna Kiplagat won the women's race in 2:21:52, needing only one try in Boston to add it to wins in London, New York and Los Angeles.
Three people died and more than 200 others were injured when a pair of bombs went off near the finish line. She pulled ahead of Rose Chelimo of Bahrain in the Newton hills to win by 59 seconds.
The Kenyan double came as a welcome boost for the East African superpower of long-distance running.
No women's World Marathon Majors victor has yet been named pending the outcome of a doping investigations into series leader Jemima Sumgong.
Sumgong's drug test was another black eye for Kenyan distance running. She wanted to run the Boston Marathon herself, but when she told her coach the idea was immediately shot down - unless she could prove herself.
Kenya was past year admonished by the World Anti-Doping Agency (WADA), which accused the country of non-compliance with its anti-doping code.
Switzer was ready to run the Boston Marathon, coach Briggs was ready to support her - but the world wasn't.