That makes sense. “Probably over 20 years ago now” probably means that there weren’t any solid guidelines or policies to revert based on, since it was only around 2006 that the community rapidly began developing formal standards. I’m betting a lot more reverts were “nuh uh”, “yuh huh” than they are today. If you still remember the account name, I’m curious to see what bullshit transpired. If the watchlist even existed back then, someone probably saw a new edit, didn’t like it for whatever reason (I have no capacity to judge), and hit the “nuh uh” button.

Something new editors get confused about (me especially; I was so pissed the first time) is that edits can be reverted by anyone for any reason. (By “can”, I don’t mean “may”; a pattern of bad-faith reversions will quickly get you blocked). Almost 2% of my edits have been reverted in some way, and plenty of those have been by people with 1/100th the experience I have (some rightly so, some not so much). Reversion is actually considered a very normal if uncommon part of the editing process, and it’s used to generate a healthy consensus on the talk page when done in good faith. But the pertinent point is that reversions can be done by anybody just like additions can be done by anybody; it’s just another edit in “the free encyclopedia that anyone can edit™”. I remember reverting an admin’s edit before (normal editing, not administrative work), and we just had a normal conversation whose outcome I can’t remember.