This is a relative statement. I think FLU had it right. Why would it not be up to you to do a little dilgence to see if the market had actually flattend out.
As for spitting in his face. Again FLU had it right. What would you have proven. If you disagree with someone or believe somthing that is contrary to your belief than you can simply walk away or ask that they not come back.
The other thing you can do is ask for empiracle evidence that supports his statement.
At some point the market is going to have flattened out and more than likely a realator is going to tell you it. How are you going to recognise it at that point in time?