Depends what you mean by memes. The things on this site aren't really memes in the original sense of the word. The reason these things are boring is probably that as humor they fall on the far billboard end of the billboard-Shakespeare continuum: they are designed for quick (but inevitably shallow) appeal.
It's just a figure of speech. There are plenty of other figures of speech that would be even more "offensive" if we applied this unreasonably strict standard to them.
What matters is not the intention of the law but how it's written. This page says what's prohibited is "actual refusal to do business with or in Israel." Do you have some other source to back up your claim? Because judging from this page it sounds like it's illegal to boycott Israel period.
"How can anyone really judge the value of an article in under 10 seconds without reading any of it? The obvious answer, they can’t."
I was curious about this so I clicked on the link. The actual answer is that you can tell a lot about a site in just a second or two. As soon as I saw the tag cloud, I was gone.