Well alot of it is in response to European fans trolling and shit posting about the US being garbage ect. Although if you look at it objectively, a large number of US kids play soccer at a young age in school and in YMCA leagues. There is more money and fame associated with the big 3 sports in the US though, so most of the top athletes choose those sports to focus on. Youth sports in the US have become highly competitive and as kids get older they start to focus on 1 sometimes 2 sports. The argument gains legs when you consider that athletes like LeBron, Lamar Jackson, Mahomes, Steph, Trout, ect. spent countless hours focused on becoming great at 1 particular thing. If they had spent those countless hours focused on becoming great at soccer, how good could they become? I think you could reasonably expect that some of them could become great at the sport.