It's real to us, which is what really matters. Since there is likely little to nothing that we can do about it if it were a simulation, there are only a few reasons to discuss the possibility.

If it's not a trap, like the Matrix, there is no point in talking about it since there is nothing that we can do about it. Either we're simulations that are gone when we "die" or when the simulation ends, or chosen among us are produced bodies outside of the simulation when we die, or whatever. There's nothing that can be done.

If it is a trap, and our bodies are hostage, or escaping would let our souls (for lack of a better term) be free to be where they are supposed to go, then it is worth discussing.

How would you go about proving it? How would you go about escaping it? What if the act of escaping it precludes going back in the rescue others? That means everyone would have to figure out for themselves that it is a trap and how to escape that trap since nobody can come back and verify that a particular method worked.