1. Vegetables have less protein (and fat)
2. Lab grown meat is essentially a vegetable for the aspects that make vegetables desirable.
3. Nearly every vegetable is already severely unnaturally genetically engineered.
If it's (b) then you are very mistaken. There is nothing wrong with (a) in terms of nutrition or food safety. We would not be feeding the world without (a) and it's a dangerous and wilfully ignorant statement to associate selective breeding with something like CRISPR.
That is using radiation or something else mutagenic to produce a lot of mutants at random and then selectively breeding them.
If this is not considered "genetic engineering" but "selective breeding" it would tend to support the idea that people are irrational about the label.
https://geneticliteracyproject.org/2016/06/13/pasta-ruby-gra...
https://unbelievable-facts.com/2017/08/atomic-gardening.html
Also nearly every vegetable has been modified via breeding as the wild counterpart is a lot less edible. For example bananas and watermelons used to have a lot more seeds.