[ahhhhnoooo]

Using your fork, knife, or spoon to point at a person is absolutely considered rude. Gesturing with utensils likewise (because you can shower others with cast off detritus.)

A quick Google search will turn up hundreds of results corroborating this.

[nayroclade]

Or just consider the “asshole dinner guest” trope that appears in so many TV shows and movies. They will always be talking too loudly and gesticulating/pointing with their cutlery.