I'm always amazed at how refractory drivers are to suggestions that we might take a taxi when drinking.
Last time it happened, my buddy was scolding me for being drunk on the way to his car. I agreed, but noted that he was too drunk to drive and suggested we go back to the bar call a cab, and have another drink.
He wouldn't do it. I'm embarrassed to say that I went with him instead of back to the bar.
A few weeks later, he scolded me for embarrassing him. I was, evidently, talking loudly in the bar about how I was dating a 20 year old (I'm in my 50's).
I don't talk to that guy anymore.
In any case, there has NEVER been a time when someone followed a suggestion from me that they find an alternative to driving due to intoxication. Maybe half a dozen times I've unsuccessfully done that.
Conversely, I once walked home when I knew I was sober enough to drive and scolded the hell out of the person the next day. Another time, I slept in some bushes next to a bar when someone suggested (quite correctly) that I shouldn't drive.