Everything is a personal choice. We have the right to err. It's not against the law to slaughter an animal because it's tasty. Seeing as though most people grant animal sentience, that they are in fact subjects of experience, that they can (just like us) experience good sensations and bad sensations, that they have 'the will' to live then that's where the rights have to come in. Of course it's not the physical act of eating meat that is the problem, that would be silly. It's the killing and harming, it's the paying for it; it's like holding your hand up and saying 'Yes, this is fine by me' - doing so you are actively supporting the industry. A purchaser of meat is not doing something benign. Vegans/ethically minded people condemn it, and right they should. It's not 'the meat eaters are doing/perpetuating something trivial and I don't like it so I'm gonna shout at them' - we are talking about something rather serious here (though the glibites will never understand. - Singer and the like have written some great stuff but you can't watertight anything because we don't share values - all you can do present the argument and hope some of it sticks.
The 'it's fine because it's natural' is a major rationalization on your part. Some people do have problem with with animals eating other animals, the nature of predator/prey life. It can been seen as a tragedy.
Dawkins - “The total amount of suffering per year in the natural world is beyond all decent contemplation. During the minute that it takes me to compose this sentence, thousands of animals are being eaten alive, many others are running for their lives, whimpering with fear, others are slowly being devoured from within by rasping parasites, thousands of all kinds are dying of starvation, thirst, and disease. It must be so..”