Sarcasm aside, gaming and FPS terminology are so tightly coupled with online culture that it's just assumed everyone knows it. Spawn camping is among the oldest examples of gaming terms that broke out into common online usage and it dates back to Quake some time around 1997.
[0] anyone older than 39 at this point
What is online culture? Is someone who is heavily into instagram for fashion, facebook for family contact and news, maybe Google for mail and search, part of online culture? Because I know people who are like that and there's no way they know what "spawn" or "camping" mean in gamer context and certainly wouldn't be able to piece together what "spawn camping" is.
To put it simply, it's a Venn diagram with two overlapping, non-coincident circles. The amount of overlap has varied with time but that doesn't mean online culture doesn't exist or conversely that everything is part of online culture.
Strong consensus bias in this statement. I have no doubt it is true in your circle (and to a lot of people). But there are plenty of online-24/7 cultures that don’t have any overlap with gaming.