Let us assume you are right, and plants "feel" pain. What would be the conclusion?

If you grow cattle, you have to put more crop/hay calories in then you get meat calories out. Which would mean, by eating less animals (best none) we would reduce the overall pain on all plants, as we don't need to cut so many of them.

I believe that plants do react on cuts and their environment, but comparing it with killing living, conscious beings, is just rude.