Was I out of line?

[JugglingReferee]

The ref ask you, the coach, "who you want the foul on?"

That's unethical. You could have taken the high road and said that, "you want the foul on the person that committed the foul," or that you have no comment, or admitted that the other person was really the fouling player.

The official should never ask a coach. S/he could ask the other official or I would even ask the scoretable in some circumstances and be sure that they are 150% correct.

Ref messed up. You could have set an example for your kids with honesty and that in life honesty is extremely important. Who knows - your players might have grown alot from seeing that and then played like they've never played before.