I completely agree. It's an extremely counter productive way to speak to someone, even if it were true. It's similar to trying to deny a persons delusions or hallucinations. You shouldn't affirm them, true, but the worst thing you can possibly do is say "well that's not real, you're just seeing things". It may not sound real or credible to them as the person not going through it, but it's very real for the one who is. In the context of CTB, the human brain is literally hardwired to do everything in its power to keep going. Adrenaline, survival instinct, self preservation- it is against the very fundamentals of humanity to attempt CTB. Thus, it's extremely common and understandable to go back and forth on it, to have mixed thoughts, and to not really know what you want. Responding to this natural reaction with a comment like that is very dismissive.