Depends on how you define "lying".

Misrepresenting what another contributor said? yeah you can be blocked.

Disagreeing on what should be in an article? That won't get you blocked. Getting into an edit war about it might. Being "right" is not a valid defense for edit warring.

In general, its not the place for admins to decide what is "true". Its their job to make sure people are behaving in accordance to the rules.