Your friend was pulling your leg.
Don't screen your compost? Why do you want to do that? If it has large pieces of stuff....give it another few months.
Linda C

'Red Wrigglers' the common fishing worm, are not a native species and do, indeed, live in the upper most layer of native soils. This would be the organic layer. These are the worms of worm farms and compost piles. They've been accused of changing (to the negative) the ecosystem of native forests. They are native to Europe, however, not Asia.

All earthworms are beneficial to the soil. Unfortunately some introduced species are a bit too efficient in their activities and too prolific in their populations and create imbalances in the organic matter of some Northeastern native forests and woodlands, to their detriment.

But in the home garden, all worms are beneficial and indicate a healthy amount of organic matter in the soil. I can contemplate all sorts of good reasons to screen compost and there is really no reason the presence of worms should deter you. The small ones will fall through the screening and larger ones can be tossed back into the pile or relocated to planting beds. It's all good :-)

Here is a link that might be useful: earthworms

I have done some large scale commercial composting. I have recently been researching vermicomposting on a large scale. Your leg may not be pulled. Read this article: https://student.societyforscience.org/article/tiny-earthworms%E2%80%99-big-impact

I read an article that the worms with the white band are not desirable (yes they are very active as well- unsettlingly so to the point of being creepy). Can't remember where I read it but I am now finding the banded ones in my compost exclusively which I recall the article

alluding to that species being invasive. I am in the process of researching and will post what I find if anyone is interested.