I think that people who are unvaxed shouldn’t get priority for transplants.
Even so, it’s not inappropriate to call out ableism in any topic. If somebody was racist, or sexist, or discriminatory in any other form, would you say, “Hey, we’re not talking about racism — stop hijacking the conversation”?
EDIT: For everyone else reading this: This is what people do when they feel uncomfortable with being called out. They deflect, refuse to admit they could be wrong, and stop engaging. That’s actually a fairly normal response. It’s hard to admit that, for example, ableist comments can be as harmful as racist comments. It’s okay to stop talking as long as one doesn’t stop thinking.