Leatherhead boss Richard Brady labelled Billericay Town a “pub team” after the Essex side inflicted on the Tanners only their second defeat in eight Ryman Premier games.
Billericay captain Richard Halle converted a 68th minute penalty on Wednesday night to take all three points at Fetcham Grove in a game with few clear chances for either side.
Victory would have lifted Leatherhead to third in the table, instead they remain seventh.
The away side were delighted with the win, but Brady was less than impressed with the post-match celebrations.
As The Tanners boss gave his verdict on the game he was interrupted by loud chanting from the away dressing room.
He said: “It’s slightly embarrassing isn’t it? They’re a bit of a pub team in the way they act.
“We turned them over 3-0 in the cup a couple of years ago - we certainly weren’t singing then.”
He added: “We knew what Billericay were going to be like - they are all guts, thunder and pressure.
“But we were no good tonight. We’d have settled for a draw but a silly individual error leads to a penalty.
“It’s frustrating because you want them to score what I’d call a ‘proper’ goal. That is now the third penalty we’ve given away, it’s just not we are about.
“The boys know we’ve got to bounce back on Saturday.”
The Tanners are at Fetcham Grove again this weekend when Tonbridge Angels, yet to win a point on the road, are the visitors.