I see what you're saying and I completely agree. Most people will not be interested in the project you're working on for whatever reason, starting with the fact that most people are not used to the crowdfunding way of purchasing goods.
With that said, I still believe talking to friends, family, and colleagues is a point that shouldn't be avoided for several reasons.
1. You never know who will be interested. If your product is for example a board game, chances are you don't know if everyone in your social circle likes board games. You have to present the idea and get to know them.
2. It's not about them directly, but also about the people they know. Again, if you have a board game and present it to your cousin, who is not into board games, he might know of someone who does like board games and pass the message along.
3. Friends, family, and colleagues are a good starting point to receive feedback. Is like your own focus group. You can check the field and see what they think or how they perceive the idea.
4. You practice pitching your idea. If your project is successful, you'll have to pitch it several times more in different situations, and practice makes perfect, so friends and family are a good opportunity to do so.
No matter what strategy we're talking about, creating an audience is never easy, and sometimes getting no real interest from family and friends can be discouraging, but it's still important to do it.
Great luck in future projects and campaigns.