Yes... it is rather annoying. And I've probably let it slip before now as well. I just gotta make sure I don't be a hypocrite if I have to step in when someone crosses the line with spoilers.
Fortunately I post about half of the news here, so I can set a good example with this until people get the hang of it.
At least it shouldn't be for very long... but should prevent too many complaints about spoilers if I don't set some boundaries early.

I figure it is just easier to moderate if we hide anything that isn't officially released, than try to determine what elements cross the line of "spoiler"... especially in topics that aren't as frequently monitored.

Also, just be careful of quoting white text, as it will then show up the text in the quote box. If you need to quote, just delete the white spoiler bit.