The Bees were blitzed away by Wealdstone after the hosts scored three second half goals with the Bees down to ten men.
The Bees made yet another slow start to a match and found themselves behind as John Okimo headed home unmarked from a Green corner.
We responded well to falling behind and had a cracking chance to level things up, after good trickery from Antonis Vasiliou found Lee Vaughan in acres of space, but the full-back's strike whistled past the post.
The Bees saw a lot of the ball in the first half, but couldn't unlock the resolute Wealdstone defence, with chances at a premium in the Easter Monday sunshine.
We would once again become the leaders of our own downfall as we went two behind on the half hour mark, as the Stones won the ball on the halfway line and broke quickly, with Dennon Lewis firing a deflected strike past the despairing glove of Aymen Azaze.
It is unfathomable how the Bees didn't get themselves back into the game before the break, as they spurned a succession of chances to get one back. First, Mason-Clark found Anthony Wordsworth in space on the edge, only for his goalbound strike to be blocked away.
Then it was Vasiliou, who was the Bees brightest player in the opening 45, who had the next chance as his deflected effort was saved by the legs of the Wealdstone of the 'keeper. Before the young Cypriot did well to work some space on the corner of the box, only for his effort to go inches past the far post.
The Bees finally got their goal back just 120 seconds into the second half, after Vasiliou did brilliantly to get into box before squaring for Courtney Baker-Richardson who couldn't miss.
It all boiled over just before the hour mark, as Baker-Richardson was shown a straight red for what appeared to be violent conduct after 20 of the 22 players were in a scrum pushing and shoving.
The ten man Bees should have been level with 25 minutes to play, as substitute Muhammadu Faal raced clear one-on-one but was denied by the 'keepers legs when trying to slot home.
It was a chance the Bees were left to rue as moments later the Stones scored their third of the afternoon, as Fasanmade poked home at the near post. It was four just a minute later as the Bees imploded and conceded a spot kick that was duly converted by Jacob Mendy.
It was five moments later as Lewis added his second of the afternoon, as he had time and space to convert with the Bees pushed high the Stones half.
Things went from bad to worse as Wordsworth limped off injured with eight minutes to play.
BARNET: AZAZE, PRESTON, MCQUEEN (Faal 65'), TAYLOR, MCBURNIE (Adeloye 68'), BAKER-RICHARDSON, MASON-CLARK, VAUGHAN, VASILIOU (Hooper 79'), DALY, WORDSWORTH.
Subs not used: Callan, Nugent.