Education is not the only way, when empathy can do so much. The bikers that came to my open-mike jams were outwardly fearsome and tough (and I played a lot of weekend biker-parties in outdoor settings, too), but were decent, fair-minded people who valued friendship and loyalty. They would buy rounds for the musicians on our breaks, and wanted to "hang out", talk about music, make requests, and get introductions to locals. Just regular folks. They wouldn't light up in the tavern, and they would encourage other patrons to step outside to smoke, without being mean about it. One day, we had a couple of idiots show up at the tavern with brand-new Springer Softails, and one of them wanted to drive into the joint and make an *** of himself. That didn't last more than a few seconds. Rudeness, lack of respect, and imposing your own jerkiness on others didn't sit well with the Iron Horsemen. They just wanted a nice place to kick back on warm Sunday afternoons/evenings.
There was another tavern a town away that my band played at off and on over during that period. The owner (another biker) was hugely possessive of our band, and his wife screened people at the door. Anybody wearing cologne/perfume was welcome to drink in the bar but was barred from the stage/performance area.
If people are well-mannered and considerate of others, no problem. If they are not, then some level of coercion might be in order, though that was never my first choice. I really loved having the Iron Horsemen around, and leading by example - people thought that it was cool ducking outside for a smoke and hanging with some bad-asses who treated them like humans and didn't foul-mouth anybody.