If I had a nickel for every time I’ve heard someone say that I’d have … well, $1.35.
Frankly, I have no fricken idea what they are talking about. The term “spiritual” comes with very heavy religious connotations; words like “supernatural”, “soul”, “incorporeal”, “sacred”, “ecclesiastical” pepper it’s definitions.
I view theist "spirituality" as part of their dogmatic mumbo jumbo. My position on them is pretty well established. Similarly, I dismiss nonreligious/ non-theists who call themselves “spiritual” as supernaturalist asshats worthy of suspicion if not outright distain.
As close as I can come to understanding "spirituality" as a concept to which I can relate is looking at the sky on a clear night, or an alpine view on a clear day, or the Sequoia National Forest on a misty autumn morning, or hear Beethoven’s 9th, and be moved to say "Wow!" in response to the awe and grandeur it evokes in me.
To be emotionally invested in, or moved by, those natural phenomena is peculiar to humans… entirely natural, nothing spiritual about it. I imagine that one who cannot experience that kind of awe or emotion is devoid of imagination, and is empathetically and/or intellectually defunct, possibly even sociopathic.
On the other hand, anyone touting their holy, esoteric, mystical, magical spiritualism are either sanctimonious gullible theists or New Age sheeple. Both are to be avoided or ridiculed mercilessly.