[LargeWu]

Same, as an American sports fan. Touching an official or yelling at them in any sort of aggressive manner is almost always an automatic foul or penalty, and possibly grounds for ejection.

My only thought as somebody who never played soccer is that the decisions a soccer referee makes are much more consequential, and oftentimes very subjective. A single call in soccer can change a game in a way that doesn't happen in any other sport.

[cycomanic]

I don't think it is true that referee calls in soccer are more consequential than in e.g. rugby. In fact I would argue that in rugby a referee could make very subtle calls (that would likely not be picked up by many fans even) that can very substantially change a game, e.g. just how he referees the breakdown or scrums. Let's not even talk about giving or not giving a try etc..