Communication implies communing, having a shared experience with another, not "talking at" or "talking down to" someone.

Create the kind of world you want to live in by how you treat others now.

Everything we do should contribute to happiness.

Remember that everyone you see and every situation you find yourself in has come from inside of you; you have created your reality by how you have treated others in your past.

Be clear in your mind what you want the outcome of your communication to achieve. If your aim is more than just to vent your anger towards a meat eater and you sincerely want that person to be a kinder more compassionate being, then you must start by seeing them as a kind and compassionate person. If you are unable to see them as kind and compassionate, then how dare you demand them to see themselves that way.

Flesh isn't the only source of protein. You can get all the protein you need from a varied plant-based diet. Protein is found in greens, veggies, beans, grains, nuts & seeds, avocados and so on. And there is no need to consume these foods in any special combination.

Be confident in yourself, in your abilities, and in your goals. Then go for it.