I spent years fighting against veganism, and there was literally no valid argument against it beyond "I don't care, I'll eat animals anyway".

There's just nothing. Eating meat is bad for the planet, bad for the animals, and more often than not in western cultures bad for the human.

First of all I think that violence in self defense or survival is justified, plants have tropisms which means they have small hard coded responses to certain stimuli like leaning toward light, they do not have any form of sense processing thus no awareness no preference theyre an object

Even if you wanted to minimise the harm caused to plants, it takes far more plants to feed livestock to sustain an omnivorous diet

Debunking a myth: plant consciousness. Protoplasma 258, 459–476 https://doi.org/10.1007/s00709-020-01579-w

There is no scientific reason to assume that plants have the capability to suffer. And different scientists try again and again to look into that. But the cold hard truth is, to feel something you need a somewhat complex nervous centrum that plants simply don't have. The same is true for microorganisms and many other simple lifeforms, btw.

Pigs, cows, chickens, even fish experience pain, stress, fear, etc. very similar to how we experience it. And we people know that, that's why many countries have laws against animal cruelty.

If you're concerned about plants, that's a good reason for going vegan.