The "pack and get out now" is actually very standard upon resignation, but more so for sales people, less engineers, unless .. there's something going on (which obviously we don't know).
Btw, as the employee: resigning via email is also not very classy, and could be done better: e.g. handing an official resignation letter in person to your direct superior face to face.
Just a suggestion. Also, if you want to air your dirty laundry, come forth with the stuff that you didn't tell us about. There's 2 kinds of lies:
(1) commission: you explicitly fabricate non-facts
(2) omission: where you fail to mention details that matter
Both are still lies. I think the employee knows how snowball started, but is refraining from telling the public. Which if that was the case, perhaps it shouldn't have been brought to light in the first place - because that'd mean the employee wants public to make a decision street-justice-style based on incomplete information.