Even though it might appear as if a loved one has their hands clasped to their ears, determined not to listen or hear you, their apparent unwillingness to connect communicatively might be due to them struggling to understand what you say. Deliberately steering a discussion into tense territory won't help with making your point, either. If you must start at the very beginning and from scratch to make your point, then try to do so. Being understood requires care and sensitivity, not force.