If someone is riding a bike due to a DUI conviction then I say more power to them. Maybe they'll never get behind the wheel of a motor vehicle again. It's tough enough to get around on a bike if you're sober and you won't get too far bombed out of your mind so it's a lot harder to drink and ride than it is to drink and drive. Sad to say but another plus is that an intoxicated cyclist is more likely to do physical damage to themselves than to others- though were I to hit a drunk rider with my car I know I'd be screwed up from it even if it were 100% the cyclist's fault.

Live and let live.

And the last thing I'd need after a DUI conviction is some well-intentioned, reflector vested, helmeted, 20 watted, lane positioning safety nanny telling me how to ride my bike.

Set the example by riding well and safely and let others learn by that and not by chastisement and self-righteous shrieks of indignation.