Of course the world Cup or champions league are bigger, even league championships, especially in certain leagues, but an Olympic Gold Medal has a global status, even if slightly less prestigious in this particular sport.
It is also by and large an age restricted tournament as well, so I would argue that it was at least on par if not more prestigious a tournament than some of the U23 domestic and international tournaments, and I would like to think we would congratulate anyone coming back with that type of achievement.
A very select few people will have the medal that Richarlison has earned, which is what makes them special.
This is not something to have a go about.