I found this on UD
A Syndrome where all the males of a group believe that a female (in said group), is far more desirable than she really is. The defining characteristic of this syndrome is that all the rest of the females (either being crazy or unattractive), make this particular female appear desirable. Alice Syndome specifically occurs in small groups where there is no outside competition from females. Alice syndrome is quite common and effects all clicks equally.
Friend 1: Don't you think Vanessa is hot?!
Friend 2: Hell yeah! She is so freaking hot! What do you think?
Friend 3: I think Vanessa is hotter than Katie, but Vanessa isn't that hot. You guys must have Alice Syndrome or something…