It sounds like it will hurt the business more than it will benefit it, which goes against the best-interests of stakeholders including yourself. Have a friendly

It sounds like it will hurt the business more than it will benefit it, which goes against the best-interests of stakeholders including yourself. Have a friendly conversation with him and decide if this person is worth working with based on his willingness to change certain behaviors that you don't approve of. If not, then you two aren't the best fit for each other as cofounders