Why Traditional electronics solder is roughly 60% tin and 40% lead, and lead is a cumulative toxin. Handling the solder or the residue leaves traces on your hands, and those traces can transfer to food, drinks, or your mouth if you do not wash up afterward. The hazard is ingestion of lead residue, not the fumes from soldering (which are mostly flux smoke), so wash your hands after any soldering session.
Watch out The claims about solder disintegrating under high voltage, tin cold-flowing into shorts, or RF turning lead into poison gas are not real phenomena; they sound technical but describe nothing that actually happens in a station.
Lead solder: wash your hands before you eat. The only realistic answer is the mundane hygiene one.