I've deleted people for similar statuses OP.
What exactly did you say? Was it just as you wrote it here or was it ranting and angry/aggressive?
Not that it really matters. If you thought people were being two-faced then the best thing to do would have been to quietly delete them.
Inviting them to delete you never really works out and it alienates others who wouldn't have been involved otherwise, as you have just learned.
I added or accepted requests from a number of people I only knew from a group I was part of a few years back. They all seemed nice at first but I soon realised that there was a lot of this sort of thing going on within the group, mostly stirred up by two or three people who liked to wind people up and then sit back and watch them go.
One person I deleted was posting three or four times a week, angry, swearing posts about backstabbers and two-faced so-called friends and to be honest, although I had liked her before, I was sick of the sight of her tantrums and dramas by the time I deleted her.
Then I got three or four messages demanding to know why I had deleted her, who had 'gotten to' me, what had she done etc. I have no doubt that at the end of that I was the subject of one of her angry statuses complaining about two-faced, backstabbers who she thought were her friends.
Another person posted a status saying that if anyone had a problem with someone she called her friend then they could remove themselves from her friends list as she was loyal to her friend and didn't want to know anybody who didn't like her.
This friend she was defending was one of the ringleaders who liked to cause trouble between others while sitting back to enjoy the show and then jumping in at the end to play peacemaker so she could feel important once she was sure everyone had argued so much they would forget she was the one who started it in the first place.
I had already long deleted the ringleader woman because of this but when her friend posted that status I deleted her as well. And got a message asking why.
So I told her, you posted that status, I don't like the woman you were posting in support of, I did as you asked because you said you didn't want any friends on your list who don't like her.
And she replied to say 'that's fine, I didn't notice you'd deleted me anyway.'
I did point out that she must have noticed, given that she'd messaged me to find out why I'd done it, and I never heard back from her 
I have about five people left on my friends list from that original group of about fifty people, and they are real friends now, they don't pull this sort of nonsense every five minutes to seek attention.
You got what you asked for OP and I can see you feel hurt and angry by it but confronting people at school and ranting about them abusing the benefits system or getting pregnant for the money won't help. Let it go and walk away. All they did was what you invited them to do.