If you have a loved one who's hearing impaired, you may have tried answering questions on their behalf in the past. Although that comes from a place of love, it's incredibly frustrating. HoH people don't need you to speak for them or over them when they're still trying to process and formulate a response.
It's also important to understand that hearing aids don't give every user perfect audio clarity, especially if a HoH individual has any co-morbidities. And although they can generally learn to work around their ability levels, larger gatherings like dinner parties or office meetings can be challenging. This is primarily because there are few breaks in the conversation and few opportunities for the HoH person to catch up and understand what's being said.
Navigating social situations with hearing loss is hard.
How You Can Help
If it's clear your loved one did not hear a question or statement directed at them, repeat it to them. You can also act as a sort of 'visual cue' about your companion's hearing impairment by clarifying to those around you that you're turning to speak directly towards them or typing and showing them your screen.
This has two effects. First, this allows HoH individuals to participate more easily in conversation. More importantly, when an observer sees someone adjust how they're communicating with a hard of hearing person, they're likelier to follow suit and make concessions themselves.
Finally, don't speak in a distorted or overly loud voice. Enunciate your words, and face a HoH person when speaking if possible. Understand that they may need a moment to catch up.