And following FastMail's reply
> Hello Andrew! Can you please contact our support team so we can look into this for you? fastmail.com/support
They say:
> Don't have time. Consider my tweet the bug report.
Sorry but this asshole behavior. Bugs happen. No need to do public shaming and being rude to the company for that.
Personally I don't really use their web interface, but I tried it now and it all works just fine (on both prod and beta).
There is far too much assholery in the world. It's never OK.
There's no amount of money you can pay to make this behavior not shitty. Shitty behavior is never a good look, but sometimes it's understandable. If you refrain from being shitty, you won't have to worry about whether or not it's understandable.
Also, the only reason that someone can be shitty and get results is because other people aren't. (In this case, "submitting" a bug report via Twitter and still getting a resolution is possible because other people reported it through the proper channels.)