Moreover, Galadriel was using magic, something that Men apparently weren't capable of (cf Letter #155) and something that they did fear; they also weren't capable of discerning between magic done by the elves and the "deceits of the enemy", as stated in the Mirror of Galadriel chapter. On top of all this, we have Wormtongue whispering in Theoden's ears against Lorien (most certainly, Imo); Denethor could have extended his despise of Gandalf to his ally in Lorien - plus he might have been induced to doing that by the palantir that was controlled by Sauron.
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