TRUE TRUE TRUE TRUE! there is no "loser pays costs" rule/law for the entire US. it is a case by case thing, determined by a judge, in most cases, even in copyright cases. the link you posted even says that.
the comment you replied to was saying that there is no nation-wide law protecting victims of unnecessary or unjust lawsuits, and there isn't. you simply cannot count on getting your costs paid for if you win in any case.