At which level does one typically learn modal particles?

I'm currently learning German A2.1 and I find the concept of the modal particles (doch, ja, nun einmal, eben, etc.) very interesting.

Is there a standard level at which these will be 'actively' taught? I can see that by learning German one gains a passive understanding of what they mean, but I mean taught in the same way that my most recent class focused on learning the grammatical rules of (some of) the subordinating conjugations (weil, dass and wenn)

My teacher often will say something like 'that's a B1 sentence', or 'that's B2 work', which leads me to believe that there is some kind of common standard between courses. However, I can imagine that different syllabuses may introduce concepts in a different order, or in a different manner.

There's definitely a difference between passive understanding and active usage. You should learn (at least to ignore and not get stuck with them) modal particles pretty early (I'd say B1) to be able to at least get a gist of a sentence without even understanding what particles do, I'd say getting the meaning of particles is somewhere like B2 and you shouldn't be expected to actively use them before C level.

Compare German particles to adverbial phrases in English - Active and passive usage expectations differ here as well.