If Burger King introduced a new burger called the "Large Mac", how prominent the "golden arches" logo is for McDonald's doesn't factor at all into whether or not this is trademark infringement. Same goes for this: is there the possibility of confusion between "Macbook Air" and "Netbook Air"? Let's say Joe Consumer heard a radio/podcast advertisement for the new "Netbook Air" (obviously there is zero chance of seeing a logo for such audio media) -- is there the possibility Joe would associate that product with Apple? That's the kind of thing a jury would need to decide.

Apple v. Samsung was over chromed rounded corners on phones; a series of cases in multiple countries, and this war between the two still isn't over.

So yeah, they've convinced multiple courts in multiple jurisdictions in multiple countries that yes, consumers are, paraphrased from their words, "pretty stupid and get confused easily."