Man Lying About About Alcohol After Auto Accident

So several weeks ago I was on my way to a job interview in downtown Houston when my lane came to a sudden stop, all was well until seconds later a semi crashed into a truck two cars behind me causing a chain reaction. The back end of my car was destroyed and I was pushed into the car in front of me, the last car in the crash. A week or so later, after searching about wtf to do next, I hear from this guys insurance that he is reporting that I was drunk at the time of the crash which is utter bs. I rarely EVER drink, let alone on my way to a job interview at 9:30 AM, so I’m pretty pissed that this person would fix his mouth to lie about me, especially after every person involved went through an already traumatic experience. I almost wish that the cops breathalyzed me at the scene so that I could call his bluff. Just wondering what I should I do about this if anything? He really has no proof as I spoke to multiple people at the scene of the crash who can disprove him, the semi was also recorded as solely responsible on the police report (as she should be)
TLDR: got into an accident with a semi truck where I was pushed into someone else and now that person wants to lie that I was drinking. I don’t even drink and he has no proof, is this something I have to worry about?
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