I’m not even sure what the technical etiquite is. As a right handed American it just seems more natural to have my knife in my right hand but if I’m just using a fork I tend to switch that to my right hand. Didn’t even think about it until right now.

American zigzagging utensil acrobatics always seemed like a lot of nonsense to me. It looks bad and fiddly.

Tarantino has a bit about it in inglorious bastards.