i think in part that the use of the terms in a derogatory way, often outside the context of discussion and frequently in a belittling and agressive manner is a reason why people don't like the terms applied to them.
i see no reason to use them beyond a discussion on the specific issue, sadly there are all too frequent times when the phrases similar to 'in your loony socialist world' or 'damn commies' gets bandied about for little or no reason.
