Years ago (early 80s), I went to a Trek Con in Philly with a friend who adored the original series. Walter Koenig (Chekov) was the guest speaker, and I met him accidentally when he tapped me on the shoulder to ask for the time. At first I was startled when he didn't have a Russian accent!!! (He is actually of Russian Jewish ancestry, but born in Chicago).
During the convention, he took questions, and a fan got up and started asking him a technical question about the Enterprise. You could see him visibly frown and get his temper in check, and then he calmly explained that he was an ACTOR, and Star Trek was his JOB. He told the fan that the actors didn't get into the technical aspects of the show or memorize every episode - it was his JOB. You could see the fan looked quite deflated, but Koenig handled the situation very nicely.
This has always been one of my favorite takes on extreme fandom - from Star Trek again (however, Shatner did put in a disclaimer before he did this scene to avoid really offending anyone):
https://www.nbc.com/saturday-night-live/video/trekkies/n9511