When people are near blindness, straining to see through thick-lens glasses, people, in general, admire their courage and have some sympathy for their challenges. I’m pretty sure if someone is completely deaf, they are also extending understanding.
Not so, for the hard-of-hearing. People yell at them. Sure, it’s what they have to do to get them to hear, but it’s usually mixed with a good dose of, “You’re really annoying.”