The boss bitterly disappointed after throwing lead away at Stevenage in Sky Bet League Two.
Southend United manager says the 4-2 defeat at Stevenage in Sky Bet League Two is a 'bitter pill to swallow', as his side suffered their second consecutive defeat.
Blues were 2-1 up mid-way through the second half, but ended up losing 4-2 following three late goals, including a double in the final six minutes.
“It's a really bitter pill to swallow,” Brown admitted after the match at the Lamex Stadium.
“Defensively we went missing. All four of the goals we conceded were sloppy, soft goals to give away. We gifted them the goals and it's inexcusable.
“I made changes today and I'll be making changes next week, that's for sure. The mentality of the group wasn't right today, and that needs to be changed.”
And Brown believes a chance with ten minutes left that fell to substitute Jake Cassidy was a key moment in the game.
Had the striker scored, Blues would have gone 3-1 up, but Stevenage 'keeper Chris Day denied the Wolves loanee and Stevenage scored their equaliser moments later.
“It's about standing up to be counted. Jake Cassidy has a great chance to make it 3-1 to us and the 'keeper saves it. We started playing for 20 minutes after half time and it wasn't good enough. We found it a difficult afternoon. Today we didn't do enough to win the game. We cannot concede four goals.
“It's a poor day at the office for us because of the stand behind the goal. They had something to cheer about and something to celebrate. We had enough at the 60 minute mark to win the game and we let the supporters down.
“We'll be working in hard in training next week. This has to be a defining moment in the season for us.”