Trump is taking advantage of a general comment to stir the pot (again). For some inexplicable reason, there is a residue of dislike for America's oldest ally, France. Any reason is a good one to insult and belittle that nation and people. Even if Macron truly represent France and the French (a dubious assumption), the comment did not at all indicate military preparations for confrontation, merely the realization that in the present atmosphere, America's good will cannot be counted upon. If anything, it was much more an economic than a military reference.
Exaggerating the situation for ill defined goals does nothing but give the ignorant another rant.