Is spraying with water when an IRN bites cruel?

My IRN still bites to try and get his own way, usually when I have something
he wants or when he decides to land on my keyboard and expects me to move
my hands.

I've tried a few options to stop him biting but nothing has really worked too well.

I've heard some people spray their birds with water to discourage them, is
this considered cruel and is it even effective?

I disagree with it if they're just being irritating e.g. being really loud, or chewing things they shouldn't but I'm unsure how to feel about it if they're
being violent.

Thoughts?