If there's one truth to social networks its that everyone's experiences on them are different, based on who you're connected to, where you grew up, what life stage you're in, and whether you have interests adjacent to toxic or problematic spaces. It's quite similar to the adage "you are the average of the five people you know best", but on a global scale. Radically different experiences can emerge from the same platform.

Personally, my experiences on FB are extremely tame and similar to yours. However I intentionally sabotaged my experience by unfollowing nearly everyone several years ago. Even my rather fallow feed is an engine of engagement and addictive impulse, in part because of years of conditioning myself to go there when I was bored.