When I am threatened my general reaction is anger not fear. Also your question indicated that it has to be one or the other. That is a false assertion.
It's the fear that leads to anger. I'm presuming that when a toddler says they'll spank you, you get amused, not angry. T%hat's because the toddler poses no threat, so there is no fear to convert to anger.
As for the yelling at an NRA rally it depends on what they are yelling and why but you know all this. Is that crowd singling out someone present? Are they shouting slurs? Are they holding their weapons in an aggressive manner?
Only one of those three (slurs) applied to the Philadelphia incident, if you were trying to draw a parallel. So, if you go to an NRA rally, and you see people with guns yelling about "Communists" trying to take your guns, do you get fearful (sorry, angry)? I'd wager not.
Stop trying to play political games.
I haven't mentioned politics.
I care that they are members of a hate group, in full gear yelling racial slurs and brandishing weapons.
Is it important that the slurs be racial? Because outside of that, you're describing an NRA meeting.
You can argue semantics all you want ...
No semantics involved. Just perception.