Some of the Maple Leafs faithful on social media expressed their discontent with Morgan Rielly's shortcomings in a 3-2 defeat to the New York Islanders.The Maple Leafs hosted the New York Islanders at the Scotiabank Arena on Monday. The Islanders completed a series sweep over Toronto with this victory, having won the home matchup 4-3 on Jan. 11. Pierre Engvall, who played his first game in Toronto since being traded to the Islanders last season, scored the late winner and ended a three-game skid for the Isles in the process.Morgan Rielly had an assist in the matchup, but many Maple Leafs fans on X (formerly Twitter) were frustrated with his defensive shortcomings, which cost them two crucial points at home.One fan tweeted:"Stop pumping Reilly’s tires. He is absolute trash on defence."Another chimed in:"Sorry Morgan Rielly number 1dman can't make that lazy play"Here are some of the other top reactions on X:How did the New York Islanders beat Morgan Rielly and Maple Leafs?In the first period, Matthew Barzal gave the New York Islanders a 1-0 lead after converting a deflected shot off the post with a wrist shot at 10:31. This was the only goal scored in the first period.50 seconds into the second period, the Maple Leafs won the faceoff, and John Tavares slid a pass toward Mitch Marner. He struck a wicked shot from the circle, making it 1-1.Just two minutes later, the Islanders extended their lead to 2-1 courtesy a backhand goal by Kyle MacLean off an assist from Cal Clutterbuck. In the final period, at the 15:12 mark, captain John Tavares' tip-in goal off Morgan Rielly and William Nylander's assist tied it at 2-2.With less than two minutes remaining in regulation, Pierre Engvall scored the game-winning goal for the Isles.Ilya Samsonov conceded three goals with a .896 SV% (26 saves), while Marner and Tavares accumulated one goal apiece in the matchup. Meanwhile, Barzal and Engvall both scored a goal, while Ilya Sorokin made 34 saves with a.944 SV% for the Islanders.The Toronto Maple Leafs face the Dallas Stars on Wednesday, Feb. 7. As for the Islanders they'll be up against the Tampa Bay Lightning on Thursday, Feb. 8.