Your response is reasonable, but what's frustrating is not that software has bugs. What frustrating is when something that worked well enough before gets a whole slew of bugs that could have been avoided by simply not adding unwanted features.

Here's an update to the piece of software that you had enjoyed using and had incorporated into your daily workflow. It has a whole bunch of features you didn't want and the new interface is so complicated and intrusive and buggy that it renders the whole thing nearly worthless. Something that worked well for you before has been taken away for no discernible reason. Becoming enraged at this may not be rational, but it is human nature.