This is the quote which is fueling the debate: "Markets getting hammered again today. Even with limited exposure the past two weeks have cost me several thousand dollars. I imagine you guys much more heavily invested in stocks have not lost anything somehow. You never do. Always up up up in your world (mind)."
Aside from the poster insinuating about "you guys" being disingenuous about the true nature of your profit/losses, it may be said that yes, with markets down, an investor may either have a reduction of their unrealized gains for some duration of time, and may even be in the red (current value of their investment is worth less than their initial deposit). Technically that is not a loss in either case until the investor liquidates their investment by closing out the position.
The root of the issue is that downturns like those of the last few sessions (in some indices) are exactly that - downturns of some unknown duration. Many long term investors see these as temporary. Other bears may seem them as indicative of someone taking a loss. But if a long term investor rides out a downturn in order to sell later at a profit when the market rebounds, then no loss is accrued. In some cases, the rebound may be in a few days or weeks, and other times it might take years.
Some here have been accustomed to "cherry picking" durations of the market when it has been on a downward trajectory as proof that investing in general is a losing proposition. Others note that markets fluctuate and trends in both directions are to be expected and that an investor should have their investment strategy positioned so as to be able to wait out the inevitable downturns.
With that said, next week should be interesting.