That is the risk one takes when first deciding to do a joke. It can work, it can fall flat, it can unintentionally offend, it can backfire spectacularly, etc.
An April Fools joke is meant to stir the pot with deception, however congenial or in good faith, and not everyone is ok with that kind of humour. You can pity other poor souls lacking in this regard, but you can't deny them their right to be all Serious Cat and take everything the wrong way, if that's how they view the world. *shrug*
Ya tells yer joke, ya takes yer chances. Sometimes you get the exploding cigar.
I do agree though, I think this topic has exhausted itself.