Morphology - does it even matter?

I’m (37) TTC with my partner (38). I have “occult diminished ovarian reserve” and he has morphology 1% (dec 2020) increased to 1.5% (dec 2021) after taking Fertilaid. We have been TTC for 6 months and because of my age and lower AMH (0.7) we are moving straight to IVF. Doctors say that Letrozole or IUI aren’t likely to help.

After getting his result of 1.5% morphology, which the medical team never discussed with us, my partner recently stopped taking his Fertilaid and has been working a ton of nights and drinking lots of coffee/energy drinks. He also told me that “it doesn’t matter, I have enough good sperm” and when we were discussing fertility, even mentioned a real zinger - that if he had sex with a 21 year old, she would get pregnant. I said, sure, but it would take longer than normal, and if I had sex with a young guy who had normal semen parameters, I would probably get pregnant eventually too because I do ovulate like clockwork every month. And regardless, we both need to take our vitamins.

I just want to vent. Even if the doctors can pick the prettiest sperm for ICSI, his lifestyle still matters! I know there isn’t a ton of research about lifestyle and semen, and that women have always been under the microscope about fertility. How can I convince him that his contribution and health matter for IVF success?