As someone who just found out he got rejected, the sender took it like a champ. Still, if he's going to be so insistent on asking "whos this?" he shouldn't respond "WHOA dog don't TRIP c'mon man" when he's asked the same question.
I do this to six-year-olds all the time, except instead of "I love you" I say "I'm stupid and I pee my pants!" If I'm lucky they'll look confused and not know what to say. More often, though, they just say "Ewwww you're gross!" and I'll go "Curse you, six-year-old!"