It doesn't sound like this is the right co-founder and if you have any inclination that this is the case at this early stage of the company then do something ab

It doesn't sound like this is the right co-founder and if you have any inclination that this is the case at this early stage of the company then do something about it NOW. Aside from the personality issues it doesn't sound like he's bringing enough to the table to help your company elevate to where it needs to be - that's business and in addressing this you might get better mileage using this as the grounds for action because they are explicit and practical. "You can't keep the site looking the way users want it" and "You don't have the product development skills needed as you are raising feature ideas that are not being asked" are all explicit issues you can use. "I don't like the way you communicate" is not, even if that is really the issue. I would be VERY careful about dissolving the company and then taking IP with you to a new company, as others have suggested. He would be in his right to lay claim to his share of the IP. There are ways around that however. Getting the company to grant each of you a non-exclusive perpetual right to the technology, then dissolving the business, then you going off and setting a new business with it is one way (that also lets him do the same, with a new co-founder perhaps, so be confident he won't be successful). But you MUST see a lawyer (retained personally, not on the business of course)