:Hello, talk page stalker here. 
 ::Stating that someone is lying is absolutely not a personal attack. All that such a statement means is that what they are saying is contradicted by reality. It makes no comment whatever about their character. If I say the sun is purple, anyone is free to say that such a statement is a lie, and that's not an attack against me, it's a contradiction of my statement. 
 :First, start by deciding whether you're talking about (A) the characterization of somebody as lying, or (B) the characterization of a statement as a lie. Secondly, note that in most societies and at most times (though with very many exceptions), anyone is free to say that anything is anything. (I'm free to call Tide rolls a hamster. Tide rolls is free to call me a stick of asparagus.) ¶ Your seeming interpretation of "lie" as merely "false statement" seems extraordinary. Here's Harry Frankfurt on lies (via a prefatory examination of humbug, on his way to the investigation of bullshit): 
 ::In this respect, the property of being humbug is similar to that of being a lie, which is identical neither with the falsity nor with any of the other properties of the statement the liar makes, but which requires that the liar makes his statement in a certain state of mind — namely, with an intention to deceive. 
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