I can't really see how "Frenchmen" - or any other people for that matter - can be both cowards and out of their league. I mean, if they are cowards, they run no risk of being out of their league. Right ?
This goes to prove that your correspondent is : A. Out of his league. And there is no need for a B.
Take the bait, you're a racist. Leave the bait alone, and you let him get away with his own racism.
Common with these clowns. You see this sort of maneouvre often among the keyboard commando corps; it is some sort of passive-agreesive flanking maneouvre.
This sort of bad faith is a typically American rhetorical game. Fai de bèn a Bertrand, te lou rendra en cagant