Can you explain the smell of a rose? I can. And if you've smelled a rose as well, you would also get the idea of what I meant by the words I used. So, it would not be only me that understands what that means.
I'm not arrogant to talk about my experiences. Why shouldn't I talk about them? If it makes you feel insecure, that's your issue. In fact, such experiences are completely humbling, because your ego is laid waste before them. I talk about them, because folks like you want to hear evidence. I'm giving you evidence of my experience. And you attack me as arrogant for talking about it?
Perhaps you actually don't want to hear any evidence? Is that the deal?
What I hear you saying, is don't talk about it if you don't want to be attacked by those who have an allergy to religious experiences and don't want to hear it, and will insult you to keep you quite. That's what I hear.
BTW, Ultimate Reality? That's a common term. You can't insult everyone out there because they both recognize it and study it as a topic:
Ultimate reality - Wikipedia
Second, the term “ultimate reality” could be taken to mean
how reality ultimately is—i.e., that which is metaphysically ultimate, perhaps a part of every complete ontology—instead of meaning the richer sense of “ultimacy” at issue here, which is not a part of every complete ontology.
God and Other Ultimates (Stanford Encyclopedia of Philosophy)
In fact, you yourself believe in an Ultimate Reality. To you, it's just a materialistic, nontheist ultimate reality. But I get it, you don't want to acknowledge these things because you've got your beliefs just the way you like them, and anyone who deviates from your vision of Truth, is "woo woo". Fundi Christians use the term "lost" or "deceived". The apple doesn't fall far from that tree for you, does it?