Is AUTHOR wrong in the post ? POST : I'm in the car with BF who has kindly offered to drop my at the metro and realize I have a missed call from a traveling friend.  I say something like 'just a sec',turn off the music, and dial my friend.  She let's me know she has arrived and is setting things up for my arrival later, asks about things I might want, and warns me about the weather at her location.  

I answer her questions and thank her for reaching out--my BF turns the music back on while I'm on the phone.  I hang up and ask him why he did that.  He notes that it was turned down, and I let him know that I think that was rude.  To be clear, every single time he or anyone else takes a call in my car, I turn off the music and turn it on once they are off the phone.  This call lasted 5 mins and 4 seconds.   We argue about whether his behavior was rude and he tells me he is "not an Uber."  What? So I have to be paying you to expect the same courtesy I extend? 

He notes that I should've waited to call my friend.  And I decide this argument is stupid.  Do I need to justify returning a friend's missed call? 

He drops me off at the metro. We don't exchange goodbyes.  

I text him.  And things go nuts: 

Me: You turning the music on made me feel like my conversation didn't deserve the same respect I have always given you.  And the throw away at the end about me calling xxxx later didn't sit well.  I called her back because I missed her call and had no clue what was up/could be wrong. 

Him: 
1/2 Just cuz someone called you, doesn't mean it's an emergency. That was rude--does she take precedence over me? Message received. We disagree--i believe tu2/2 rning your music down enough so the other person can hear the person they're talking to is good enough. You don't agree--I'm sorry. 

Me: It doesn't mean it's an emergency but it could have been, I didn't know hence the quickly returned call No one says she takes precedence over you.  She did not text. I had literally no clue why she called The best way to be sure was to call, which is exactly why I called 

Him: Look, that's the only conclusion I can reach. Literally, you could have called her back in 10 mins. But it's ok. Safe flight and have fun. 

This goes on back and forth for a while and ends with 

Him: I'M MAD THAT YOU HAVE THE AUDACITY TO COMPLAIN ABOUT THE VOLUME OF MY MUSIC WHEN YOU DIDN'T EVEN NEED TO BE ON THE PHONE RIGHT THEN. 

Was my expectation of silent car inappropriate? Am aita for calling my friend back while in the car?  

Tldr: called friend back after missing a call. BF thinks I should've waited to call her back and shouldn't be upset that he turned his music on while I was talking. 