Is cracking your knucles bad for you?
First of all cracking your knuckles isn't your bones grinding together, it is air being released from between your knuckles
And yes, cracking your knuckles is bad for you because it damages your ligaments and it erodes the cushion between your fingers which will hurt you. The safe way to crack your knucles is pull at them until they crack.
I used to also crack my knuckles all the time so at first it is hard but later it will not be botherish.