First, they should respect your reputation and privacy. For example, you may not want the competition knowing that you work with an IT consultant, much less the project you are working on. A good consultant respects the customer's privacy and reputation with their silence.
Second, they should not show favor to a specific technology. No technology should be seen as holy. If they seem to direct your focus to a specific technology that costs, you should ask yourself whether they receive a commission for it. Instead, IT consultants should advocate for practical technological tools that increase the productivity of their business. The knowledgeable consultant understands that industry awards are less important than a functioning system.
In addition, the IT consultant should keep an open mind to the your ideas. If they seem to shoot down your ideas right out of the gate because they want to look smart, you should look elsewhere. The point is not to tell you why your idea will not work. They should be looking to understand where you are trying to go with the idea and find a better way to approach it if need be.