CBP, maybe not - there’s a lot more leeway for things that happen at the border, for better or worse.
But in general US law sets a high bar for claims of incitement. Your hypothetical statement would certainly be considered protected speech. That is, of course, not to say that you would not be a victim of vindictive prosecution ;)
But in general US law sets a high bar for claims of incitement. Your hypothetical statement would certainly be considered protected speech. That is, of course, not to say that you would not be a victim of vindictive prosecution ;)