"If you don't have an opinion, then is there a point of having you in this meeting?"
There's nothing I hate more than people without original thoughts and opinions. The one thing that differentiates us from each other is our ability to think critically and add value through experience, thought and perspective. However, there are people out there who don't have anything to contribute.
While some people feel that they don't want to offend anybody and stay neutral, doing this adds no value (and if you're not adding value, what's the point in involving you at all?). If someone was hired to be an expert in a specific field (let's say digital marketing since we're all about that), then they need to have an opinion about what to do with social or how best to approach PPC for clients. However, if they just 'go with the flow', then we might as well have hired a robot instead. They're a waste of resources.
Read more about why I hate people with no opinions here.