For me, something is objectively real or true if it continues to exist or be true even if nobody is left to know it. We generally know which of the phenomena of conscious existence inform us of our internal reality and which represent external reality. When I enjoy a glass of lemonade, and you are watching, I know which of my experiences you are sharing with me and which you are not. You're also seeing a glass with a yellow (or pink if that was my choice) liquid with my hand clutching it and pouring some of it into my mouth (or being sipped through a straw if that is my choice).
We both know that if indeed this is lemonade in the glass, I am experiencing something wet, cold, tart, and sweet, but only I both know it and am experiencing it. You only know it. And I am aware that you only know it.
I would say that you were experiencing the objectively real aspect of my experience,and I was experiencing the same objective truths as you, as well as a host of subjective experiences, and I would know which is which.
If we were both died at that moment from a gas leak, for example, the glass, perhaps now shattered after being dropped, and its contents, perhaps now spilled, would persist for a time. And we both know that.