Lindybeige is a fantastic explainer when it comes to that sort of thing - it also highlights how quickly a person can go from knowing nothing to practically hobbyist levels of knowledge in 20 minutes post internet
How many times have we had that conversation with someone who knows their topic backwards and forwards and after minutes, we have a deeper understanding of it than almost anyone around. Expand that out to an hour with a few key/relevant questions to frame the conversation and it is totally believable.