YANBU.
Tell ur DH that if he wants to keep what hearing he still has (because we all lose it with age and he has less than average) he needs to wear the HAs as much as possible. Otherwise the neurons (or something like that) won't get stimulated enough .... and will die. (True I believe.) So it's not just that he should wear them for YOU. (It' sto protect the hearing he still has for later on.)
I have a hearing impaired DH, so I have some experience. He's pretty deaf now, (as his hearing has got a lot worse over the yrs), & has to wear his 2 HAs all the time, except when sleeping. (Or swimming!) He is very good at doing so. (But still gets frustarted with his poor hearing at times ... of course.)
My MIL, on the other hand, never wanted to wear her HAs. (DH's hearing problem passed down from her.) And was very annoying to her DH as she couldnt hear and wouldnt wear them unless she was going out!
But, to be fair to her, HAs are a lot better now than they were when she 1st had them, say 40 yrs ago. (They were quite rubbish before.)
She's still not very good with them, (ie her HAs), but she does try a lot harder now, for sake of grandchildren. (To be able to hear what they say.) And she's less vain with age, tho they are well hidden under her hair which is easier for females than males.
Hope your DH has got "good" digital HAs ie which fit and work properly? (Otherwise he might have a reason for not wanting to use them ie if they hurt him or if they don't function well?)
But, (assuming the HAs work and don't hurt), please tell him to "use them or he will lose his hearing faster" which might frighten him into wearing the HAs more often?
He really needs to use ALL THE TIME.
Our son has also had (very bad) hearing from an earlier age than his dad, but (like most kids) he adapted to the situation far quicker and more easily than an adult. And his (uncomplaining/no hint of self-pity) example had a very good effect on both his father and his grandmother, as surely if he (a little boy) was happy(ish) to wear his HAs all the time, they should be too? (So they did.)
Good luck with convincing your DH to wear his HAs more often. It can be annoying to live with a person with poor hearing, (I know), so he needs to help you as much as he can, as he will need your good will, your help and your patience/understanding!