I’ve been told I am not clear about my needs but whenever I bring something up I get misunderstood

Multiple people have told me that I am not clear about my needs or general issues. But whenever I say that I would wish for xy behavior, or that I dislike it when someone says xy, I either get laughed at, told I'm too sensitive, ask for too much or disregarded in any other way. How do I make it clear what I want?