You are wrong (again... and again) if you believe that being pelted with bottles, struck with baseball bats and blinded with pepper spray is not a violation of your Constitutional right to "freedom of assembly". Yes left wing racists also have the same Constitutional protections and I would condem anyone stopping them from making their ridiculous public rants.     

You cannot force others to support your behavioral proclivities if they do not want to have anything to do with you.  We are talking about behavior, not skin color.  
Southern Democrats fled the Democratic Party in droves when the Extreme Left took over the Party.  Democrats are the Party of Divisiveness.  You would never find a Black Caucus in the Republican Party nor a racist counterpart White Caucus.   

I would love to have you provide the Republican Party's "Welcoming Speech" to the Democrat Racists of Slavery and Jim Crow fame. It should be easy since it is a matter of public record.