What really boils my shit is when I explain where I currently am and what are the current problems and the customer / boss just scoffs and says "well just do X,

What really boils my shit is when I explain where I currently am and what are the current problems and the customer / boss just scoffs and says "well just do X, duh!". Happened many times and happily I managed to tell 90% of these people to eff off. Currently working with one guy on a startup idea and he's often like that. I understand his side of the bargain is not easy either and perhaps my problems as a tech-cofounder and very likely a future CTO in the company (if the idea, funding and market fit take off) might seem trivial to him but... it's just disrespectful and infuriating all-around. He knows his stuff and that's what drew me to him. But this continued ignorant disrespect I can't tolerate much longer. He's also genuinely baffled and surprised when I blow up. I don't know how much more time I can last like that. I am considering ditching him.