Now I have a better picture. Not justifying your partners action in the slightest, I do want to say a few things that I hope you consider.
Some referees are minimalist; I would put myself into that category. If a player can play through a situation, I tend to let it go. Advantage/disadvantage plays a big part in this. While this is a general statement, newer refs tend to call more than those that have a few years under their belt.
Your call in his primary is understandable. You probably had a better look at it than he did. Younger players tend to crowed the lane; girls tend to do this more than boys do. He may well have been blocked out. Unfortunately, this is something that you should cover in a pregame. Read back on some of the threads and you will see some that say. just pick someone in this type of situation.
In general girls have less body control than boys and they tend to use their arms/hands more than boys do. While this is not a very nice thing to say, a joke I have heard and used when assigned a girls game is, Oh well, Ill have to decide what not to call. Dont get me wrong I actually prefer doing girls games as there is not a court of junior MJs in the making. Plus, there is much less guff from them.
How do you approach your assignor? Very carefully I would say. The best tack I would think would be to tell him/her that you have now done 2 games with Mr. Wet Shoes
and that your stiles just do not match. Could he/she help you in understanding how you can be a better partner/ref or if you could be assigned to the broadest range of partners. Ill bet the assignor knows all about him and will try to help.