It's not that they picked the wrong guy to threaten - it's just that this particular one won't work out for Monster. No worries, on to the next. If 1 guy out of 100 fights back, and then you just leave that one alone, you're still a big winner.
In reality, he just sent them a slightly-snarky response to their flimsy cease-and-desist, and they decided not to go forward with a lawsuit, which is probably how it would have played out anyway.