The Bees took a 1-0 lead going into the break after German midfielder Vitaly Janelt tapped home from close range in the 15th minute.
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And Antonio Conte's side were lucky they didn't find themselves 2-0 down at half-time after Ivan Toney had a goal ruled out for offside.
Spurs struggled for consistency heading into the World Cup break after losing three out of their last five top-flight matches.
Things didn't go to plan at the Gtech Community Stadium, with the north Londoners now conceding the first goal for the sixth league game in a row.
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And their performance was lambasted by former star O'Hara, as he joked he'd rather watch Harry Kane miss a penalty for England at the World Cup again.
In a series of tweets, he said: "Same old Spurs then…."
He followed that up by posting: "Slow, boring no ideas, it's good to have Spurs back."
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The talkSPORT pundit then stated: "[Yves] Bissouma is Mr touch tackle he's absolutely shocking."
Giving his overall analysis of the opening 45 minutes, he remarked: "Shambles first half as usual from spurs, look miles off it.
"No creativity no desire no willingness to run.
"I'd rather watch Kane miss a penalty in the World Cup than that first half again, painful."
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To make matters worse for Spurs, Kane was taunted by the Brentford fans over his missed penalty against France.
Though the travelling Tottenham faithful loudly showed their support for their talismanic centre-forward.