Blocks are directional. Why should there be etiquette involved? The blockee can just reciprocate if they wish. Problem solved.
Ah, here comes the "all-is-obvious-and-neutral" comment from ozzie. Here's your answer; it's not about blocking, it's about human interaction. TheGrobe is well within his rights to complain about cmibu's behaviour, and he is well within his rights to refuse to block whilst doing this.
Besides, if TheGrobe blocked cmibu, it would have zero effect on this thread, as it is someone else's. So, you're just plain wrong, this is a matter of etiquette.
It's sort of cute how you're fighting TheGrobe's battle for him.
I get bored easily 
(btw congratulations on finding the best move in the position)
That doesn't really show anything. Look how few comments he's made and how many of them are in this thread or reacting to people in this thread.
I think you caught his attention by posting about how difficult it is to get into your group. Now he sees it as his quest. He has taken the first step by trying to impress you.
by kco
Perth Australia
Member Points: 19735
he got you suck in cmibu, your cover is blown !