so, I have been asked if I wouldn't mind delivering a christmas card to someone- and this person (who's meant to get the card) has been nothing but horrible to me and treated me like **** and like I don't exist and am invisible

I have said that, and that she should deliver the card herself, but she said you do it... it will be nice

but I'm sat here with the card now wanting nothing more than to tear the ****ing thing up. they don't deserve a card, at all

what do I do