Trump didn't get much of anything from Xi, certainly not on the Iran issue, so he touted some peanut deal, others said China would continue to buy them from Brazil and only a small amount from the US. Then Trump talked about some massive Boeing deal or whatever and the next day the Chinese said, slow down, we discussed it, nothing has been finalized. It's a rumor, but which I don't find hard to believe, Trump was so mad returning from China he forced his team to throw away all the gifts they got into a dumpster at the airport.
TL;DR
I presented a conspiracy theory above