Just Keep It Kosher
This person doesn’t have to reveal their profession to let us know what they do. To those who can’t figure it out, this person works as an IT employee at some company. According to them, they know whatever it is you’re doing on your computer. Everything. All the websites you visit, the people you chat with, the games you play—they know it all.
Thankfully, at least in the OP’s case, they don’t care. As long as what you’re doing on your computer isn’t illegal, chances are they aren’t going to report it to their higher-ups. We’ll leave it up to you to determine what’s legal and illegal.