He held his head high, wished Team Canada luck and returned his attention to the Windsor Spitfires, finishing the season as OHL Goaltender of the Year and on the OHL First All-Star Team.
Since then he's signed a three-year entry-level contract with Vancouver, was a member of Team Canada at the 2018 IIHF World Championship and attended Canucks Prospects Development Camp.
Next up for the 6-foot-1, 200-pound DiPietro is 2018 World Junior Summer Showcase in Kamloops, BC. The 11-game round-robin tournament will be attended by 40-plus Canadians hoping to crack Team Canada's roster for the 2019 World Junior Ice Hockey Championships this December in Vancouver and Victoria, BC.
A spot on the team eluded DiPietro last year. This time around he's hoping for a happier ending.
"Last year, [not making the team] was definitely not ideal," he told Canucks.com during the World Championship. "Little bit of heartbreak there, but it made me a better goalie and a better person.
"My whole life it's been about making this team or making that team and having a little adversity thrown in my face, at the time it wasn't very fun, but looking back on it, it was probably the best thing for me. I'm going into this year really hungry for it and it will help me be better."
The Amherstburg, Ontario native has taken part in four other Team Canada sanctioned events: 2015 Canada Winter Games, 2015 World Under-17 Hockey Challenge, 2017 National Junior Team Sport Chek Summer Development Camp and 2017 National Junior Team Sport Chek Selection Camp.
Puck drops July 30th in Kamloops at the Sandman Centre, with Team Canada (split into red & white squads) playing their first game July 31st.
DiPietro is chomping at the bit.
"Not making the team helps you not be complacent and feel entitled to anything," he said. "Everything is earned and I've always had that mentality, so I'm really grateful for the opportunity to try again this year."