The first event has successfully finished, and the criticisms started to appear just like any other sport. It seems that some people are not happy that their respective countries did not win. Just like any other games, the people watching have more to say than the players themselves.
They can just casually say stuff like that as they are hidden in the veil of anonymity while the players are actually giving their all against their opponents. Although only a small part of the community is actually toxic like that, but they are usually the loudest.
There are also people in the community that will defend the honor of those who did their best. It goes to show that some players are just not able to immediately adapt or have the luck to actually survive a sudden addition to the event. Then again, the Pandelympics developers only told them the basic rules of each event.