Without any context, we really have no fucking idea what this bumper sticker is about. I mean, there's a whole lotta guesswork about whether the "boy" is underage and assumptions that the driver of this car is not also underage and while all the speculation in this thread about that is pretty amusing, the only "offensive" thing that anyone can truly make heads or tail of is the word "fuck".
Now if this was a NAMBLA bumper sticker or something that said "I like fucking little boys", then you would see plenty of outrage.
I think it's safe to say that folks here don't like racism, nor do they like pedophilia, but without the context for this bumper sticker, there's just no reason to try to believe this proves otherwise.