Was about to upvote you until your last sentence.

Reason being, yes, I agree that a huge problem with globalization is that, while developed countries have spent many decades building things like labor rights, environmental protections, IP protections, etc., globalization essentially allows an out for companies to undermine all of these base-level rules.

But there is a very good reason people are blaming "free markets" and "libertarians" - lots of the cheerleading behind globalization was based on people espousing their love for free markets and libertarianism. The fact that you may disagree with their definition of free markets and libertarianism doesn't change the fact that their definition is the one that is most widely acknowledged.