Honestly, Color of Law, you have absolutely no idea of what you speak.
First, MSG was one of the MOST important 2A advocates in the entire state of Washington. Had you been even moderately active, you would have had many occasions to meet him. As a retired Master Sergeant, he has absolutely NO problem getting his point across. He was the heart of the Open Carry movement in Whatcom County, and beyond. We were gutted when he and his lovely wife, an accomplished advocate for freedom in her own right, decided to move east. You should be grateful that we have such an accomplished and persuasive individual educating and providing outreach.
Second, you should familiarize yourself a bit more with the law before you attempt to educate others on its import. As a private business owner, one actually CAN refuse service, and even trespass, for almost any or no reason. The ONLY reasons that would be actionable is if they were to cite a "protected class" reason for your removal. Thus, if they kick you out for your race, religion, national origin, age (over 40), pregnancy, disability, pregnancy, veteran status, gender (if that's still a thing), or familial status, they would be subject to legal action. Some states have additional protected groups. Thus, if they kick you out because you are white, black, asian, et al, they are breaking the law. However, if they kick you out because you stink, don't meet their dress code, use language that they don't like, or even because of the gun you wear, they are not breaking the law.
Personally, as a libertarian, I disagree with all laws of association. As a business owner you should be able to hire who you want, serve who you want, and even refuse who you want. Invariably there will be some racist, sexist, or other type of A-hole, and I will be happy to stand outside on the PUBLIC sidewalk with a sign and discourage people from patronizing their business. Ultimately, the market will make its corrections.
That said, if you really want to see how 2A outreach is done, you should be a little less abrasive and confrontational, and actually watch MSG work. We need to change some hearts and minds, because the lovers of liberty are starting to age out.