It's not just bad for the solderer. It will contaminate areas around your solder area (do your kids ever do a project on your workbench?) And at end of life, lead is a problem in land fill sites and in e-waste recycling.

Indians (including children) desoldering components from imported e-waste have high blood lead levels: https://journals.lww.com/epidem/fulltext/2011/01001/High_Blo...