Oh, oh. Grandpa Trump saw something on TV he didn't like and proceeded to threaten anyone involved with his temporary discomfort.  

If protesting police brutality is "disrespecting our flag" as Trump maintains, it's a short step to protesting Trump as disrespectful and to be censured.

And of course when Trump says "our flag" he is referencing his fan base at this rally; people who agree with him, largely white and largely people who welcome dictatorship if they think it will benefit them and most importantly, hurt their "enemies".

SAD!