"this statement" = "As we all try to understand what this vote means to us, I want to affirm to anyone on our team that is scared or feels personally exposed, that I and everyone else here at Grubhub will fight for your dignity and your right to make a better life for yourself and your family here in the United States."
Basically, if you don't feel like you can be part of the "everyone here at Gruhub [who] will fight for your dignity and your right to make a better life... in the United States," you don't belong. Nothing about the act of supporting Trump, per se.
What he says at the core is perfectly fine.
His mistake is politicizing the message when there is no need for that and hinting at a connection between Trump becoming president and that the people who voted for him likely don't support what is written in the e-mail.
From an outsider's perspective: The reason for that might stem from the fact that this election was fought like a war, as in, they demonized the enemy. This was especially strong when it came to Trump. So now that the election/war is over, some people can't go back to view the "other" side in a rational way. For them, that side is still exactly everything the media told them it is and I believe that is the case here.
This statement being "I want to affirm to anyone on our team that is scared or feels personally exposed, that I and everyone else here at Grubhub will fight for your dignity and your right to make a better life for yourself and your family here in the United States"
I wonder what happens if somebody tells him "I voted for Trump, and now I'm scared and feel personally exposed".
I don't know how to view this. Clearly Matt wants to protect his employees from bigotry to not make them feel scared. But now the Trump supporters may feel scared. In this company, are they turning from a perceived oppressed minority into an actual one?
It's all very paradox-head-explosiony, and there aren't good answers.
Do you really think that someone who voted for Trump, and now fears for their employment in the context of a hard-left industry and hometown full of people freaking out and making wild threats, is going to carefully parse the letter in this fashion and decide they have nothing to worry about?
Imagine you got this letter from your boss. Would you then happily stroll up to him at the water cooler and tell him how proud you were to vote for Donald Trump on Tuesday?
Basically, if you don't feel like you can be part of the "everyone here at Gruhub [who] will fight for your dignity and your right to make a better life... in the United States," you don't belong. Nothing about the act of supporting Trump, per se.