hey Riley,
I don't know how your situation can end up, so take any advice that you may construe from my words with a grain of salt. When reading your post, I couldn't help but relate my own personal story with that of yours. When I had friction with my old group of friends, I found myself in shoes similar to your own. Deleting them out of your life may just be the only way to go. It will most certainly feel hurtful, but I guarantee you that you will end up better in the end. Think of your transition as a filter of sorts... any acquintace of yours that leaves your side in this moment would have undoubtedly done so in a variety of other situations. These people are below you in very man things.
Now, when they are off Facebook and your life you will begin to make new friends. Great friends. People whom you would love for your old friends to see you have made. And your life will get better... and eventually, you won't even bad an eyelash when you pass them in real life or see them pop up somehow in your social media feed... you could care less for their (inferior) mentality because you are so much better than them that they have literally no power at all over you. The lion cares not for the opinion of sheep.
With that said and done (maybe those paragraphs were more for me than you tbh) I truly hope that things work out with your friends. Just recently one whom I thought to not ever talk to again followed me on a social media profile and liked some of my posts. It was a small step but it brought me a smile. I'm sure no matter the outcome you will only come out stronger