That's a bit over the top. The forum is supposed to encourage the community to help each other, not "ban" people because of something trivial like this.
Sure the link was wrong, but he was trying to help and is also the only one so far to have posted something regarding the OPs question. However, calling darrsi a nob for realizing the mistake isn't acceptable since it isn't darrsi's job to find the correct link. Most people wouldn't think to check the sellers other items
In any case, it mostly boils down to if you don't have something nice to say, then don't say anything. Let's try not to kill the community here