How can you tell at the next meeting that jack has grown very antagonistic toward Ralph?

Jack basically tries to publicly usurp Ralph's role as chief. Jack accuses Ralph of not being a "real" chief. He accuses Ralph of being weak, liking Piggy and making the boys do boring things. He chastises Ralph for fearing the beast and not getting meat. Jack then asks for a re-vote. The boys don't openly vote Ralph out. Jack goes into tantrum mode and storms off. Most of the boys join him later.