From what I remember the American constitution says you have the right to & can censor anyone if you want. It's your right as a private citizen.

Censorship becomes an issue when the government censors others or doesn't directly censorship someone but uses the private sector and forces a company to censor others. The government has no right to censor others. 

I don't associate with people I don't like. I will censor them if I have to. It's my right and i believe in those rights.