At Vance events, a back-and-forth with media is red meat for the crowd

It sounds like at events featuring Vance, interactions with the media play a big part in entertaining and engaging the audience. This may mean that Vance (if this is a person, such as a politician or public figure) often partakes in lively discussions, interviews, or debates with the press as part of his presentations. The reference to “red meat” could mean that these interactions are especially enjoyable or satisfying for the crowd, similar to how red meat might be considered a treat for carnivores. This term