By doing so, he broke the unwritten law "Thou shalt not speak out against Israel". As a result, he was flooded with comments by the people at GIYUS who tied to smear him, although, oddly, they didn't end up labelling him "Anti-Semitic" which is the usual response.
I just hope it doesn't stop him from making more posts on the topic, but judging by his responses, it's unlikely. Good! Tweet