In general, I don't like arguments. However, there are good types of arguments in a startup. Things like which feature should we build next. Or should we add a feature or improve what we have. Should we change our Terms of Service. Should we remove a feature. Should we hire this person or get a contractor. What's a bigger opportunity for the business. Should we raise money, should we sell.
These are important discussions to have. If your startup is debating these issues. Good for you. You're developing healthy habits and having good arguments.
On the flip side. Be worried if nobody cares or if everybody just takes your word.