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I guess the comments went away now...
There is currently no record of these comments, but we might be able to dig them up. If you have serious concerns about a particular user's behavior (not necessarily Gerhard), please contact the moderators directly at moderators@mathoverflow.net (rather than using meta).
SKR- if you are going to flag a comment as offensive and complain about it on meta, copy it here. Other wise, we may be left it our current situation of not knowing what you are talking about; the only comment of Gerhard on your answer looks perfectly reasonable, so I'm assuming one is gone.
What Ben said. The comment looks reasonable to me too.
If someone points out a mathematical mistake to an author, even a small one, it is normal practice for the author to politely thank that someone for noticing and helping to perfect what s/he has written. And, most people don't think of that as any big deal or anything to get huffy about. I think, "oops, you're right -- thanks" would be an appropriate response.
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