Citizens have the right to say and do all manner of stupid things, with the understanding they're solely responsible for the consequences.
Funny how you only give a shit about the military when it's self serving.
The guy didn't just state his view, he viciously attacked Trump. Whether you agree with what he said or not, Trump responding was certainly his right.
He could have made the point there are Muslims who are loyal to America without personally attacking Trump like that. And he did it in an ultra partisan venue, the DNC convention.
Trump had every right to respond
Agreed. So why the butt hurt over Khan?