I'm doing a PM so we keep things private. I understand if you are not a friendly sort. But remember. Just like in a business, even if you do not like a customer or are in a bad mood you still have to just smile and be pleasant. Other wise they will not return to your business again. The same applies to a forum. Especially when you are asking for advice.
If you really do not want to be friendly. It's best to just not reply.