If you use the verbiage "he seemed intoxicated or under the influence" - not letting me leave the vehicle and rambling on about feminists and conspiracy theories, this is a better way to report it because they will absolutely deactivate him and investigate his behavior. Also tell them that you would like to be unmatched but not through the rating system because you are afraid that he will associate the time of his rating dropping with your ride. Be sure to include the date/time/ticket number/pick-up location and drop-off information when you report him. Don't worry, it's against Lyft's TOS to disclose information about the rider (passenger) who reported the driver and them telling him he's accused of being intoxicated instead of "he made someone feel unsafe" leaves less of a chance that he'll associate the report with you.