Was I harsh for calling my friend a slut? Please read?

[Cool J]

I called my this girl I know a slut. I knew this girl like for a year we chatted couple times on Facebook and on whatsapp. Her pics on Facebook were normal average nice pics like a selfie with her sitting down but now her pics are more slutty. In her pics now she is always showing skin like cleavage, stomach or wearing mini skirts, laying down, duck face etc. Now she is so full of her self. This girl literally change her profile pic like 4-5 times a day always a new photo. The likes she gets on her pics probably got to her head. She is talking to more guys now especially like those swagger type guys. She skypes with guys that lives in different cities and all. My friend knew her and he added her on Facebook and they chatted. He said she told him that she had 9 boyfriends in her life. Btw she 20. Told I chatted with her I told that she is full of herself and becoming a slut. She blocked and deleted me. That may be harsh but I can't stand vain girls

[Ash]

yes you were harsh now go and apologize

[Naomi]

I'm not trying to sound rude but how is her being a slut affecting you in any way shape or form?