Obviously that’s how you feel, but I know many atheists who cannot only discuss spirituality, but dedicate quite a lot of their time to practices that arguably are very spiritual.
I think, often the issue is how spirituality is defined. I often see it confused with religion, a religion that is reliant on the actual existence of gods/goddesses. Religion has been defined without the use of such gods of course eg William James stated that religion as a belief in “an unseen order and that our supreme good lies in harmoniously adjusting ourselves thereto”
For me, this definition also serves well for spirituality though. Scientists agree that the universe is made up of energy. People who are spiritual would largely also concentrate on this. How everything is energy. There might be differing opinions over how much this energy can be manipulated, how many layers of energy exist and to what ends but there is a shared basic premise.
Rationality and spirituality happily coexist in many. Blake’s quote of “everything that is now proved was once only imagined” can be interpreted in several ways but at its most basic can be seen as science often finds evidence of what was previously just a thought.
Of course, many philosophers are also atheists, yet those who are spiritual often share similar thought processes but sometimes with different conclusions. However, there’s enough shared foundations to spark great conversations.
To discuss or debate something doesn’t mean that you have to agree, in fact that wouldn’t really be a debate. I think I’m the key is respect, to be open, to ask, to seek, to clarify. Like this thread has illustrated confusion can arise over language and concepts, but these things can be clarified (all these things apply to all parties). What stops discussion is shit like “sky fairies”, or trying to make out that spirituality is the same as being stupid. Some of the most erudite and intelligent people I know are extremely spiritual (some of whom are also atheists).