Maccha tastes like an old man's asshole, and no it's not stale, it wasn't made wrong. It just tastes like ass
It's interesting that you should have such expertise in the flavour profiles of the assholes of elderly men...
You haven't had maccha then or have had some fake maccha or really old and / or bad quality matcha Maccha has a earthy and strong tea leaf like taste that comes in after the earthy taste