Most tests concerning intelligence fall prey to confirmation bias. Some, even worse, setup the test to fall into what we already know is an ability/tendency of an organism and then wrap it in a human-oriented; often overly-emotional, abstraction.
I find the word 'threat' is played a little fast at loose. A joke or aggressively charged comment can still have some wiggle room. Sometimes comments are just mean spirited and malicious. Sometimes its important to remember the context of anonymity.
Her firing was not uncalled for. A quick trip through her twitter feed is all one needs to see how her motivations tend to be political. Her response was sensationalist. She has a bad sense of humor and no respect for free speech. Its sad to see others take up for her just because they find a second-hand conversation a little too crude. The world can be crude and those of us who can take it do not have to shut up so you can feel good.
I wont suggest SendGrid anymore because of this. They can keep her on staff or fire her -- I won't forget that she made it there in the first place. Like the poster above says. This comment was posted in 2009: http://imgur.com/5tbXR2c. That is before her employment at SendGrid. Does the SendGrid hiring department not know how to research?