There's not much negativity toward them just a bit of criticism on how they're handling this outage.
As I mentioned in another comment of mine on that thread - they should have reached out to customers and let them know there's an outage (especially if this is an outage that is > 10 minutes).
P.S: I still think Sendgrid are awesome and fortunately they'll listen to what we have to say and next outage will be handled differently.
A female Sendgrid employee overheard a joke mentioning a dongle looking like a phallus, took a picture of the guy, posted it to Twitter, and he got fired from his job without anyone hearing his side of the story. His apologies were ignored.
P.S: I still think Sendgrid are awesome and fortunately they'll listen to what we have to say and next outage will be handled differently.