I for one am not laughing at this situation; tell you why.
We are in the last days, so God help those who don't know that.
We're also a lot closer to Christ's return, but that's going to be a good thing for us who believe on Him as The Saviour.
So, what is it that bothers me about those kind of predictions in 'these days'? What's different about our times compared with the previous date setters that failed?
I'll tell you what I'm expecting to occur soon in our days, and I think many of the brethren are feeling it, but can't put their finger on what they're feeling (i.e., the birth pangs).
Per my understanding of Bible prophecy, we may expect the Antichrist's coming soon. Not our Lord Jesus with a rapture, but a fake coming in His stead. Along with that, we may expect the start of the "great tribulation" our Lord Jesus warned of.
We all are going to have our Faith tried like never before, and some of us will be delivered up, even by deceived brethren.
Those who have been taught to flee prior to the tribulation will be sucked into a lie by that false one that's coming. And they will be found joined with the workers of iniquity by deception when Christ does return after the tribulation. They will be 'taken' in deception by the false one who comes first.
With the metaphorical fig tree in prophecy, there's a prophecy about the winter fig that grows during the winter, but falls off early in the Spring. True spiritual harvest time per the fig metaphor is in summer. That's when those in Christ are to be gathered. Not early in the Spring like a winter fig, but later for the true harvest in summer.
Some are not going to wait for the summer harvest time, but will be as the winter fig and be harvested too early, in the Spring. That first early harvest will be by the Antichrist, since he comes first prior to our Lord Jesus' return. This is what our Lord Jesus was pointing us to in Matthew 24 about a false one people will say is Him, and Christ said for us to not believe it. That's about His Message of warning that wheresoever the carcase (dead) is, that's where the eagles (vultures) will be gathered together. It's about the deceived who flee to the fake messiah, thinking he's our Lord, and thus becoming a winter fig, harvested too early, in the Spring, making those part of the spiritually dead (carcase idea).
Could this be what all the May 21st hype is about? the time of the locusts come to devour? Could be. It could be the start of the final events of the end of this world. Not Christ's coming and our gathering, but the completion of the final 'beast' kingdom of Revelation 13, and start of its 42 months reign.
So with every breath of those behind the idea of fleeing early like a winter fig on May 21st, that may be the timing when Satan's servants on earth plan to begin their final stage of takeover of this earth and setup their world kingdom. Personally, I don't think that it will start this year, but it might, since I believe we have been in the 5th Trumpet for some time now, a time of sealing God's elect in prep for the tribulation.