Irritated and hormonal

Tara
Yesterday I recieved a message from my bf's oldest sister telling me I needed to change part of our sons name. He's getting two middle names, Michael Ray, because they're both family names, but his sister flat out told me I need to change it because if and when she ever has kids that's what she wants to name them. Everyone's told me to let it go, but it's still irritating. Why would you tell someone that? Then say if I didn't drop the Ray part there would be trouble?! Help!