How do strata committees respond to repeated complaints from one owner?

Our small strata complex is generally harmonious, but one owner opposes almost every decision made by the executive committee, even when it benefits their own lot. Sometimes they suggest an idea, but when it's brought to a vote, they change their position and oppose it. Their objections are often based on misunderstandings, and when others disagree, they accuse them of bullying. They also send long, detailed emails after meetings demanding compensation for actions they don't support. Responding takes a lot of time, especially since they rarely attend meetings or review past materials. What should be the committee's level of response? Is it acceptable to reply briefly and generally, rather than addressing every claim in detail?