"They're the No.1 team in the world and for me, I'm disgusted, honestly", she said.
Another former Canadian worldwide, Clare Rustad, also unleashed on the United States team on the TSN coverage.
"I think they could have won with humility and grace but they couldn't manage to do that".
"Celebrating goals later in the game like this is just completely unnecessary".
The Americans led 3-0 at the break and then broke the match open in the second half, with the players celebrating goal after goal. Some perspective: The US men's team has scored 13 goals in the past 6,202 days, according to Sports Illustrated.
Rose Lavelle and Samantha Mewis netted twice each while Lindsey Horan, skipper Megan Rapinoe and substitutes Mallory Pugh and Carli Lloyd also found the net for the United States of America in an embarrassingly one-sided Group F encounter watched by a crowd of more than 18,000 at the Stade Auguste-Delaune. If you sign up to a service by clicking one of the links, we may earn a referral fee.
"For all that have issue with many goals: for some players this is there first World Cup goal, and they should be excited", 2015 World Cup victor Wambach wrote via Twitter.
"The bottom line is that this game was not fair or ideal for either team", former United States global Yael Averbuch West wroteon Twitter.
Morgan was involved in the second goal, too, playing a neat one-two with Rose Lavelle before the latter produced a 20-yard effort that Thailand goalkeeper Sukanya Chor Charoenying could only fumble into the back of the net.
"Both did their best given the situation".
"We really just came into the game really wanting to showcase ourselves, " Morgan said. "Every goal matters in this tournament and that's what we were working on this game". "I think we did that".
The Americans out-shot Thailand 40-2 and had 73 percent of the possession.
"Obviously we have the utmost respect for everyone we play, but it's the World Cup", said captain Megan Rapinoe.
A set piece led to the third goal for the US just past 30 minutes, as Lindsey Horan hit her close-range shot into the roof of the net.
2015 Women's World Cup hero Carli Lloyd was a second-half substitute against Thailand.