Malcolm Gladwell did an entire podcast episode on this. It wasn't a few years ago, it was like the early 90s. And it wasn't that vegetarians were pissed, it was

Malcolm Gladwell did an entire podcast episode on this. It wasn't a few years ago, it was like the early 90s. And it wasn't that vegetarians were pissed, it was because someone had a heart attack from eating terribly, and then made it his mission to run a campaign against the "dangerously" unhealthy fries made from beef tallow. Eventually McDonalds caved for PR purposes.