This absolutely is not true. Vegetables are some of the cheapest things you can eat. Certainly cheaper than dairy and meat, which is heavily subsidized.
https://thebeet.com/is-it-expensive-to-be-plant-based-quite-....
You can just google this, or, you know - try it.
The vegetarian stuff that costs a lot is:
- If you shop at WholeFoods, but their prices are insane anyway
- If you only eat Organic AND are picky about what you eat if you're ONLY ORGANIC. Organic has HUGE price swings, so if you're only organic you need to swap out what you want to eat, if you care about cost.
- Meat substitutes - which can be good, but don't fit your bill generally - they are often heavily processed.
Yes, it takes a GOOD amount more effort. You have to literally eat more, yes. That means you have to cook more. If you are cooking, the cooking is often more involved. Of course. But you also don't have to go full veggie either.