Are you familiar with the concept of context? It's helpful because it allows easier communication by not requiring words to mean the same thing at all times.

In this case, it is helpful because we can scale our understanding of the poster's disappointment to allow us to not have to consider how it might be disappointing relative to, say, global thermonuclear war or a first kiss, but only need to think about it in relation to the other topics of discussion.

I highly recommend using context whenever communicating.