I’d say when it comes to veganism it’s basically up to what you personally want to eat. I personally have no moral quandary with eating animals but if you do, I wouldn’t call you a hypocrite for eating jellyfish. Plants feel pain too, in a similar way, I could see it being justified. Taxonomy shouldn’t decide your morality.
Ok but how are plants not being exploited? Also it could be said that you can get meat without exploiting animals, such as getting rid of invasive species. At a certain point it’s not a diet it’s an ideology, and I feel they should have separate names. Because let’s say you’re just against exploitation of living organisms, then you’d be fine with eating invasive species, or meat hunted yourself, but deny eating anything from a farm.