[Zircom]

Not to pretend I know anything about you or your partner and y'alls relationship, but her being a non-tinnitus sufferer and not having personally experienced it herself doesn't make her unable to "understand" the issue and accommodate you in the manner of your choosing.

Assuming that you've sat down with her and clearly communicated exactly how you want her to handle situations when your tinnitus makes it hard for you to understand her, if she's still choosing to completely ignore that in favor of shouting and being unreasonable to the point it turns into a fight, that just reflects poorly on her and her willingness to be even minorly sympathetic and accommodating to a loved one's currently incurable medical condition.