My last full-time job in IT (this was 2000-2002): The guy next to me in the IT department was using the goatse pic as wallpaper , the guy across the room from me watched porn during his lunch hour, and the other guy in the room told me that my knowledge of computers meant nothing because “no one thinks some chick know anything about technology.”
I never thought that this was harassment because I ran into this in nearly every tech job I held. Before that was a half-dozen years as a mechanic & body shop worker, and although the garage had the mandatory Snap-on calendar and the guys made filthy and inappropriate jokes, once they saw competence they treated me decently. Not so much in IT; they saw my competence as a threat to their manhood.