All greetings are weird, if you think about ’em.
Let me clarify that statement. It’s not that greetings are inherently weird, it’s that they all become weird if you give them the slightest thought. You want your greeting to come off as natural and effortless. That sense of effortlessness will be destroyed by even the slightest doubt in your mind, the kind of doubt that comes from briefly thinking should I wave and say “hi,” or just wave? Or just say “hi”?
Once you’ve given your greeting any thought whatsoever, whatever you do will come off as weird and forced.
Now that I’ve pointed this out, the next time you greet someone, this will happen to you. Feel free to curse me under your breath. That’ll make it even more awkward.