A "Sex offender" is the opposite of the "Sex defender", in which they cause sexual assault

The Backup Dancer Zombie (From plants vs zombies) is a enemy who can be summoned by the Disco zombie. The Disco zombie is a very well know pedophile in the PvZ lore and since the Backup dancer zombie has only been seen accompanying him, it can be decuced he is also part of the Disco zombies group of pedos.

Yes.
The backup dance can be seen in PvZ showing off his chest hair by unbuttoning his shirt. Therefor he is attempting to unclothe himself, he is also trying to do this around freshly planted plants which are mere minutes old, therefor i conclude the Backup Dancer from Plants vs Zombies, is a sex offender.