It is the right of most organizations in most states/countries to exclude people of their choosing. They have verified a couple complaints and decided he was enough like a person they wanted to exclude. Which it sounds like he was doing from his side as well.

So I'd say that legally, he is being considered innocent.

This is like 'I can say whatever I want without the consequences of my peers because of the first amendment.' The right to free speech and the right to be innocent until proven guilty apply to a citizens relationship with the government.