Newcastle United 0 Hull City 1
Already facing the wrath of the FA following brushes with match officials at Fulham and at home to Stoke, Kinnear can expect yet another letter from Soho Square following a first-half showdown with Phil Brown that saw both managers ordered to the stands.
And it was to get worse for Kinnear as Newcastle crashed out of the FA Cup at the third round stage when Daniel Cousin pounced for the only goal of the game nine minutes from time.
This was the ninth meeting in the competition since the sides first met 99 years ago. The only defeat previously suffered by Newcastle was a solitary goal quarter-final replay defeat in 1930 - before the Tigers went out in the semis after another replay to Arsenal.
Six-times winners Newcastle went into the tie having scored in every game at St James' Park this season - that was about to change - while Hull were without a goal in any of their previous three outings.
But Hull had happy memories of this ground having won here 2-1 in the Premier League earlier in the season.
Xisco, having his first action of any sorts since October, wasted a golden opportunity after 16 minutes when, unmarked and just eight yards from goal, he lifted a Jonas Gutierrez cross over the bar.
Newcastle were then denied by the woodwork five minutes later when Danny Guthrie's whipped in free-kick found Nicky Butt whose flick crashed to safety off the bar.
Tempers flared after 22 minutes when Fabricio Coloccini was booked for a challenge on Cousin.
United boss Kinnear was furious and this in turn sparked a reaction from opposite number Brown and the two managers went head-to-head much to the annoyance of referee Phil Dowd who banished them both to the stands.
Michael Owen should then have done better when a mistake by Paul McShane and Sam Ricketts let him in but he drove over from the edge of the box.
Owen should then have opened the scoring two minutes into the second half when a delightful ball from Damien Duff saw him spring the offside trap only for Matt Duke to get enough on the ball to see it trickle agonisingly past the upright.
There was a blow for Hull after 68 minutes when they lost skipper George Boateng who was stretchered off following a block challenge from Butt and he was replaced by club skipper Ian Ashbee.
Hull had created nothing, but they finally broke the deadlock after 170 minutes of play in this third round tie when some woeful defending let Richard Garcia drill the ball into the area where it was bundled over the line by former Rangers striker Cousin.
United at last upped the tempo and Owen wasted a glorious chance when Guthrie crossed perfectly for the striker who, just six yards out, totally missed his header and the ball bounced off his shoulder into the arms of Duke.
Owner Mike Ashley was once again missing, but the jeers from the crowd at the final whistle were crystal clear - if Ashley does not get the cheque-book out, Newcastle are serious relegation candidates.