Lead in primer gets blown out to coat inside of cases and barrels. So should we throw out spent brass and buy new brass for reloading due to lead dust? Of course not.
How do we treat spent cases to reduce exposure to lead? We handle/process/clean them so as to not breath in lead dust (or work outside with good ventilation) and clean our hands afterwards (or wear gloves).
I feel like I got lectured. I've worked in an indoor range and understand good hygiene. My scrap brass is contained. My rockchuckers spit primers on the floor. I don't leave them there. I could go on. I didn't tell anyone what to do. Just said what I do and why in one sentence.