He isn't spreading "information". He's stating his opinion, to which he is entitled. As are we all.Masks have never been touted to be 100% effective. Yes, it's going to spread no matter what, but masks reduce the spread. Less people sick, less opportunities for others getting sick. If 1 in 100 are sick, is it not understandable that you have a higher risk of catching it vs. 1 in 10,000?
Masks are better at preventing outgoing droplets containing the virus from spreading into the air. There was a recent study that says they MAY provide some incoming protection as well, but perhaps not much. So your co-worker likely became infected a) because he let his guard down somewhere, b) someone else with COVID near him wasn't wearing a mask or c) sometimes unlikely scenarios happen (aka statistics) where an infected person is wearing a mask, some amount of droplets escape, and get through the infectee's mask. There's plenty of videos where the lighting shows all the spittle that comes out of your mouth just from talking. How hard is it to understand a mask is an effective barrier against sending out those droplets? Do you cover your mouth when you sneeze?
If you have actual evidence of how this is a placation/placebo device, and I don't mean a one-off "insider" report, I mean good enough for court evidence, I'd be willing to reconsider. Otherwise, I think it's a disservice to others' health by spreading this kind of information around. People are dying, and I'm not saying this is you by any stretch, but I'm tired of hearing "well, it's mostly the elderly." That's someone's Mom, Grandad, Uncle, Friend etc.