Judgement call ?

[WeekendRef]

Had a doozy last night in a State Quarterfinal that went against us and I am still not sure if the umpire was correct :
R1 on first , grounball to short where it is fumbled he then tosses to second baseman to start DP . R1 starts his slide straight into the bag with his arms straight up in the air . Second baseman throws the ball straight into his bicep....ump calls automatic DP because he put his hands up . Is this the correct call ? I honestly am not sure if it was correct or not but it appeared as if the home plate Ump agreed with us (Without saying it) and at one point the plate umpire asked to base umpire to confer with him alone (3 man crew) . Bottom line is the call was not changed and automatic DP called .
I just wanted to get some feedback on this....thanks !