Liking your cousin?!

So her grandmas brother had a son. Let's call him D. D had a son named J and J had a son named M. 
Anyway my niece said her friend who is 14 was sexting her cousin. Her FUCKing cousin! And then they were using it as your naught, you like your cousin.....😑😷 he's 16! And in a differant state! Anyway my niece isn't friend with her anymore. She said "- is a Thot. I don't need those kind of friends. I'm going somewhere in life!"
How wrong is this? Am I over reacting? 
10 being worst. 1 being nothing 

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