Disposable chopsticks are a bit of soft wood or bamboo. Your processed and bleached napkin probably has a higher environmental impact. Compare that to a plastic fork, or even a metal fork that accidentally ends up in the trash.
That said, most people have re-usable ones at home. Metal ones can be tricky, but easily last a decade or more. Bamboo ones are also common. Both are dishwasher safe.
That's an interesting question and I couldn't find a direct answer. Let's use a good old Fermi estimate instead.
This report [1] tells us that the "global disposable cutlery market was valued at $10.1 billion in 2021."
I checked the Walmart website and they sell various disposable cutlery packs at about $0.04 -$0.08 per single unit. I know it's not an accurate representation of global prices, but it's a good start. I'm going to use $0.05 per unit in my estimates.
A market size of $10.1 billion divided by $0.05 gives us 202 billion units of disposable cutlery used per year.
The report I linked above mentioned that disposable eating utensils "are generally used once and then discarded".
Let's assume that a person uses two disposable utensils per day. That's 700 utensils per year.
202 billion divided by 700 gives us little less than 290 million people using disposable utensils.
Let's also assume that those 290 million people use exclusively disposable utensils. It's likely not true - say, some people might use disposables eating out but reusables at home. It lowers the average yearly usage of disposable utensils down from 700. This would increase the number of people who use disposable utensils. At the same time, it would also increase the number of people using reusable utensils.
How many people use forks and spoons and knives (of any kind)? I've seen anything between 1-2 billion. Seems plausible.
1.5 billion (total utensils users) - 290 million (disposable only users) is 1.21 billion people using reusable utensils. About 400 million households, at 3 people per household.
A crude estimate, but feels in the right order of magnitude.
That said, most people have re-usable ones at home. Metal ones can be tricky, but easily last a decade or more. Bamboo ones are also common. Both are dishwasher safe.