Yes, we all love our favorite operating system or etc. But responses to FUD must appear as impartial as possible. Responses that start with ``You know, I have Microsoft NT certification and have used NT a lot in business, but ...'' are likely to get more credence than statements that begin with ``I've been using Linux since version 0.1 and I won't have a Microsoft product on my computer because Microsoft products suck.'' Remember, the FUD victim (the person that the FUDmonger is trying to convince) probably has used Microsoft products. Telling him that Microsoft products ``suck'' is not going to convince him of anything except that you are biased against Microsoft products. Also remember that he has no basis of comparison. Most probably he has only used Microsoft products so he does not know that other products may supply a more reliable solution for a particular business problem. You must educate him.
Note that the appearance of impartiality requires you to present both strengths and weaknesses of the product that is being attacked by the FUD. You want to emphasize the strengths and minimize the weaknesses, but not to the point where it is obvious that you're ``spinning''.