Grok (Twiiter's AI) says:

A person who consistently listens to and supports an obvious liar might be described in several ways depending on the context and their motivations:

• Enabler: This term is often used in contexts where the supporter might be enabling harmful behavior, not just lying but other negative actions as well.
• Apologist: Someone who defends or justifies the liar's behavior, making excuses or rationalizing the lies.
• Partisan: In political or highly polarized contexts, this person might be so loyal to a group or ideology that they support the liar due to allegiance, regardless of the truth.
• Dupe or Gullible: If the person genuinely believes the liar, they might be seen as someone who's easily fooled or deceived.
• Loyalist: This implies a kind of unwavering support regardless of the evidence against the person they're supporting.
• Co-conspirator: If they're aware of the lies and still support or spread them, they might be considered part of the deception.
• Cultist: In scenarios where the support has a cult-like quality, where critical thinking is suspended in favor of complete devotion to a figure or leader, regardless of their honesty.
• Denialist: Someone who refuses to accept the truth or reality, choosing instead to believe or support the lies.