I can admit I never knew this before I watched this video and it sure makes sense why ignore biting when you can show them it hurts? I myself used to just ignore biting with my African grey and now I have started to show her it hurts and I haven't got bitten hard in a while, She did bite me yesterday when I asked her to step up but it was just a scratch you see what I mean? She now knows how much pressure will hurt me and she didn't have to bite too hard because she didn't feel threatened she just wanted my hand away.I recommend you watch this video to fully understand and by the way Tiko was sorry for biting me and stepped up and I brought her to the bathroom for a shower and then she came on my bed to chill lol and we both got Pasta for dinner and ate together.
https://youtu.be/PoXMWj-RMh4