Arguing is no longer a mutual exchange of ideas.
People who don't feel heard shout the loudest.
the insults, and the all caps are the first things that let me know what kind of a person I am dealing with, and where their pain lies.
People who are secure in their beliefs don't feel the need to go on and on and on about them, and beat others over the head with them.
That just wears people down, it doesn't win anything.
Even Winston Smith eventually agreed that 2 + 2 = 5. Not because he believed it, but because he wanted it to stop.