It's not feasible to ask everyone to even understand how to do that.

> yet most sites still attempt to load FB tracking scripts.

(Emphasis mine)

So yes, they do, and all that's irrelevant victim blaming because it's really unacceptable that this is something the user should have to bother with. It also requires an unusually high level of technical competence just to not get stalked, which is likewise unreasonable.