They would count HN if they wanted to get you for obstruction or lying to a police officer. I think that's the material point. Just better to not say anything

They would count HN if they wanted to get you for obstruction or lying to a police officer. I think that's the material point. Just better to not say anything and let them discover that your social media is HN on their own. That's the only course of action guaranteed to generate no more trouble than you may already be in. Even keeping quiet may not help if the police want to use that against you. Or they could out and out lie. No guarantees really I guess. Just try to be in a place with officers possessing some degree of professionalism I suppose. Then keeping quiet helps.