I absolutely agree you should not eat things after the Use by date : Meat , Fish etc
Best before dates I class as more advisory , we use our common sense so if it looks ok , smells ok, and tastes ok - it's ok.
But what item of food have you eaten that was out of date and you lived to tell the tale and how out of date was it .
Ours was last week , we ate a jar of Bali curry sauce Best Before date 2015 . No after effects .