In general, to see plastic cutlery in your dream suggests that you are not being true to yourself and your values. Specifically: Plastic forks can mean that you should be careful not to believe everything you are told - and don’t exaggerate to others either. Plastic knives may represent anxiety about a male person in your life - you can solve this by being more honest. And plastic spoons could suggest that you’d like to feel more comfortable in your own home.
[1]