The frustrating part is when you try to make Disco a better place e.g. by trying to mend problems with people, and you make one mistake in an unrelated setting and the positive development of weeks does not just go out of the window, but the starting point is not even reset at 0, but at minus 10.
This experience I would rate the most disappointing in quite some Disco time because it somehow makes me question the ability or willingness of the community to actually change to the better.