It's not really an actual problem more than it is a fashion statement, which is against the ideals of people trying to use it as a legitimate self defense tool if all else fails.
Most people want to live a normal life. Go to places with family and friends etc. Having a gun is a personal choice, and those that choose to carry usually feel that if they have the capability to carry legally and safely to do so just in case no other help can get to you in time. Similar to wearing a seatbelt without expecting an accident to occur. And if it's not for you it's okay we understand.
Open carry has a place. On police officers, in wilderness areas where predators are common, and on range days. But at a restaurant or store is NOT one of those places you should open carry even if you can legally.
It brings all the attention to you and your gun and usually gives off a negative first impression. Any "bad guy" will simply target you first and by surprise. Or take your gun's value as a sign of how much expendable income you have. And it brings about unwanted interactions as seen in the comic, but if you are open carrying maybe you are probably looking for that reaction and in that case it's not purely self defense it's attention seeking.
I carry a concealed gun when I can, I respect responsible gun owners but open carry people are not responsible in my eyes. They make us all look bad imo.