I don't think it's a veiled threat. Sounds like Brandon being a punk. pulling his weight.
Simplest explanation is that a virulent variant is available that the current vaccines stop. We're not dealing with nice people.
End game could be tha,t as bad as the current vaxxes may be, there's some coming that are worse. So you have the current Vax rollout with people protesting. Kill them off, saying I told you so. When the next vax is ready to be rolled out all will be knocking down doors to take it..
Trump said the other day that protesting the vax is playing into the bad guy's hands. He didn't say not taking the vax, he said protesting it. My take would be that those not taking the vax should get out of public life as much as possible.
It's obvious to me that quitting jobs rather than not taking a vax is a lot more effective than protesting in large groups. The protests are what's driving the lockdowns.
Trump doesn't say shit like protesting is playing into the bad guy's hands to hear himself talk.