I wish we would stop being so sensitive. Thrashings in soccer are normal in Europe and South America especially in the lower levels. It's not considered "rubbing it in", it's celebrating your own play.
If you don't like thrashings and people celebrating their good game, play better. It's super simple.
I find it highly ironic that terms like "running up the score" or "act like you have been there" are so prevalent in the US in an attempt to tell people it's bad form to play to your full ability while at the same time trash talking seems to be a cultural rite of passage.
America, the land of the mercy rule and trash talking. Apparently those things aren't mutually exclusive.
Agreed plus it should be remembered that despite even the best outcome of team building, these aren't two robotic monoliths playing against each other.
Sure if you compare on paper, Brazil vs South Korea is hella lopsided, but it's not like a single Brazil player scored all 4 goals and was whooping it up further and further each time (even in that scenario, scoring 4 goals as a single player in a world cup match would be insane, and deserve ecstatic celebration), these players scored a goal for their country on the biggest stage that they've been dreaming about since they were kids.
I think some nuance and this context is ignored sometimes to conveniently create villains, and I get it, its sports, they are games at the end of the day and the theatre, drama, and characters are part of why we love it.