This article from https://unitedrecoveryproject.com/rehab-blog/how-to-sober-up-quickly/ might help convince him. It explains the science behind alcohol processing and debunks those common myths. I printed something similar for my brother who had the same attitude. The hard truth is nothing speeds up alcohol metabolism - only time works. Each drink takes about an hour to process, and no tricks change that. Maybe offer to be his designated driver or get him rideshare gift cards? Sometimes practical solutions work better than arguments