Is J Street a Friend of Israel's?

Goldblog reader Eric Sommer writes, in reference to the latest J Street dust-up:

Let's be clear: Deputy Foreign Minister Danny Ayalon is a fool.  This is the second big embarrassment he's caused to Israel and he lacks diplomatic skills, which is just slightly problematic for someone in his position.  When one is a member of a government, one doesn't have the luxury of acting on one's annoyances.
That said, I can understand the desire to snub the J Street-sponsored congressmen.  You write that J Street is "not anti-Israel, not by a long shot."  Well, here is where one gets into the 'I'm-doing-this-for-your-own-good game.'  As a political moderate (no delusions about peace, but a believer that reaching an arrangement is in Israel's best interest) and as one the few of my friends who was not all up in arms at Obama's (sadly-bumbling) attempt to nudge Israel back to the negotiating table, I still find J Street to be arrogant and belligerent.  There's a fine line between pushing a friend to do something that you believe is in her best interest and taking pleasure in sticking your finger in the eye of someone who has the audacity not to see the correctness of your position.  I believe that J-Street crosses that line.  So while I couldn't claim that they are anti-Israel - not like, say, Syria - I certainly don't see them as friends of mine.  And especially now, with Israel's precarious diplomatic position, we could use less "friends" causing us harm (like being the catalyst of the stir with the congressmen in the first place) in the name of friendship.