like anything else, owning Anti fog lenses is a learning curve. You will figure out how to handle them in time. FWIW, the dude that sold you this pair sold then because of the smudges inthe lens. He knew the drill.
I had a drop of water get in a pair of old Oakleys and they were ruined.
My current Oakelys, I carry the bag they came in with me and if I need to wipe the inside or out I use it. So far so good.
I had a guy throw a pair of EG2.5's at me last weekend at Keystone and told me to keep them because he had damaged the coating inside. I recoated them with an anti fog spray. They look better, but I havent had them out to try them yet.
I used to coat my MX goggle lenses all the time without issue though.