What he did was certainly wrong, but certainly not a firable offense. A stern warning from HR would've sufficed.
Also, I don't understand the hate and DDoS directed towards SendGrid. I think if any, PlayHaven should've been subject of it and pressured to reinstate the dev in question.
SendGrid should've been pressured to warn her, not fire her like it happened.
We commit mistakes every once in a while, and losing your job is a big punishment. It's like getting your car seized by the government for speeding 10% over the speed limit.
Unfortunately the outcome is that a message is sent that DDoS works to get people that the internet mob doesn't like fired, and that a part of the male tech community is wielding that power.
What if parts of the female tech community retaliate with a DDoS against SendGrid now?
Looks like the male privilege extends to having the resources to perform DDoS.