Actually, yes. I didn't say it was THE reason, I said it was a reason. You're suggesting that there's only one reason for being overweight. The study referenced above disputes that argument. Please note that I am in no way saying that leading a sedentary lifestyle and eating too much or the wrong things are also causes of obesity. Obviously they are, and major ones. But the data seems to suggest that it's more complicated than that.
It's not an excuse, it's a reason.
Percentages aren't people. If someone commits a crime and then says that to say they did it is racist - that's ridiculous. If however someone assumes that a person is probably a criminal because of the color of their skin, that's racism. Do you not see the difference? Imagine spending your entire life being hassled by cops because people who look like you are statistically more likely to commit crimes.
If I may refer you to this article: http://arstechnica.com/science/news/2011/08/users-treat-criticism-of-favorite-brands-as-threat-to-self-image.ars
I'm confused by your response. Besides the fact that Android runs on phones and OS X runs on computers - which I do think is a salient difference - I also don't understand explaining away one company's bad behavior by pointing towards another company that's doing the same thing. I don't see what Android does as being at all relevant to people's frustration with Apple and their move towards rigid control of their platforms.