Sure, you can pull personal anecdotes of people buying less razors. However, on the flip side one could pull anecdotes of them buying more in response. My point, again, is...
that I was taught in business classes that studies have shown such stances have little to no negative effect on business. I don't care enough to argue. It's a shaving commercial.
Your point is that you don't care and don't think it'll do much. My point is that I appreciate knowing and will act accordingly. You: "nah, man." Me: "yeah, man." *shrugs*
Unless the teaching material is open source and any of us could reference and talk about it, it doesn't really matter. It amounts to you being an authority - "take my word on it."
It cannot be understated how much the Gillette shavers don't matter. Let's talk some more about how they don't matter. Such empassioned speech! ;) Very no effect on sales!