Simply the best reaction is no reaction!
Not to mention is being unaffected a DHV switch but a secure alpha male doesn't care what she thinks. Treat her as you would a 5 year old cousin that just called you a poopy head. You kind of look at the child and say, "Ok. that's nice" patting her shoulder kind of patronizingly, while looking away.
Again, having no real reaction to it is the best thing you can do. Down to even ignoring it. But for that bad of SPAM I'd treat her like the little cousin that called me a stupid playground type insult.
CHEERS!