So my husband face timed my mother in law this evening so that our kids could talk to her and my father in law, my 4 yr…

So my husband face timed my mother in law this evening so that our kids could talk to her and my father in law, my 4 yr old son naturally asked to talk to grandpa after talking to grandma for about 2 min so she gives my father in law the phone and I hear her say "if they don't wanna talk to me then why don't they just call your phone?!" Then after about 15 min of talking to his grandpa my son asked to talk to grandma again so my father in law went to give her the phone and she yelled "I don't wanna talk to them!" I was so hurt when I heard my son ask why grandma didn't wanna talk to him. Who does that?! He's 4 yrs old! Who in their right mind gets mad at a 4 yr old for wanting to talk to grandpa first?! I'm so mad at her but more hurt than anything. She's the type of woman who believes she is never in the wrong and likes to make big deals out of everything so I don't know if I should even bring it up to her and let her know that I didn't like how she treated my poor baby.