ok... to HSHLM
I think you need to slow your roll, back off and give the little guy some room.
1. an egg is not a proper diet. Get on a proper diet, instant HPW is good.
2. At night before you go to bed and after the glider wakes up, sit by cage and talk to the glider. IF he is biting then back off!! he is scared so just give him some food and talk to him. dont get bit.
3. If you have some time during the day when he is sleeping, put him in a bonding pouch with a slice of apple and wear him for a few hours, don't overdue it to start. After a few hours put him back in cage.
4. If you think he is getting less scared, in a few days or weeks!! or even a month. make the bathroom glider safe, and caring him in bonding pouch to bathroom and spend an hour with him.
He has been with you for only a few days, your going to need to give him some time to get used to you, take it slow and give him LOTS OF TIME!
PS if a glider bites me, I pull away, it hurts. But I don't get bite much, as I try to limit the glider having a reason to bite me. With new gliders I put treat on a small plate, sometime new gliders don't know how to eat a treat from your hand without taking part of your finger with the treat, they learn to take treats nicely.
We just got 4 new gliders, one is very mean, big crabber. he's nails had not been cut in forever and he was sticking to fleece. So my wife took a hand made sleeping pouch with a small hole in it, she put the pouch inside out and on her hand. she grabbed the scared glider and pulled pouch right side in so glider was inside it. I took crabbing glider and held him tight but nice, and pulled out arms and legs one at a time and the wife cut nails. After we got done and put him back to cage he was still ok with us, even more curious then scared and we didn't get bit....thank the lord.