“It is the rudeness here, and how so many Trump supporters are flat out nasty to anyone who doesn’t support their guy.”
If you want to be disabused of that notion:
I invite you to peruse my forum page and see who is more rude, Cruz-bots or Trump supporters.
A number of Cruz-bots, you can notice, will state that anyone who supports Trump is a fool.
It applies to both sides, so saying “well, he does it to!” really doesn’t address the problem