Not so public feeding

Hey ladies! New mom here! So a friend of mine wanted a play date at my home and spend the night. She’s not BF but I am and my child is cluster feeding. I have a pillow that mommy cozy pillow that goes around and a poofy T shirt. I wore a nursing bra too. My friend decided to take a hot blanket and throw it over me. I thought it was strange but didn’t know I was being offensive. There was no men around and it’s my house and I believed I was covered enough but yes my nipple was out….in my babies mouth. I just thought she’d understand with my child being only 3 months old he’s at that stage of eating every two hours and it’s a lot for me. I looked at him and his head started sweating….idk…I don’t understand how someone could bring themselves in someone else’s domaine and do that. I could understand if my baby was older but these new born stages are sensitive. Am I over reacting? But yeah this is why I don’t want to have guest at my house.