Ok, let's unpack that.

What do you mean by "the right"? Do you mean that the government cannot stop you? That is true, they cannot. The government can only outline the consequences of your actions. They cannot stop you from spreading disease, only dictate what happens if you do.

Do you mean that if you spread the disease there should be no consequences? That is not true because of the NAP principle. Most Libertarians would consider an intentional spreading of disease as aggression.

And finally, are you only talking about COVID? Wearing a mask helps to reduce the spread of any respiratory illness. If you are making a moral point, please let us know how often you wore a mask prior to 2020.

BTW - I'm not OP.