And you can’t prove it either. provide some evidence for your claim (that isn’t some unrelated study misinterpreted by silly news anchors)
while you can’t prove a negative, it is possible to find evidence for a positive claim. so, very much, you don’t know that. the truest thing anyone can say is that there is not a conclusive study that supports the claim.
Even if plants might feel pain, we are certain that animals feel pain. Also if you think for whatever reason that plants feel pain, then, well, a vegan diet uses less plants because its a more efficient food source. Plants feeling pain, whether true or false, isn’t an argument against veganism in any way.