I think in regards to the situations in the original post, but also lots of other stuff i'm seeing going on, people have a deep seated desire to feel like they are an oppressed minority being victimized by an evil entity.
Vegan smells a grill, "They are doing this on purpose! They hate me because Im vegan!"
Griller gets asked to stop, "The vegans hate us, and they are trying to take away our tradition and destroy our culture!"
Of course they can get 4000 people to their bbq if those 4000 people have a steady diet of the right propaganda over the last decade of how vegans want to get you.
People berkeleying love to be oppressed. They gobble that E36 M3 up. And the smart organizations sell you your oppression by the truckload.
SEMA: "The government is gonna make it illegal to modify cars!!!! They hate us and everything we stand for!!!!! They want to destroy our culture and traditions!!!!!!! Only we can stop them!!!!!! Give us money to help fight the good fight!"
NRA: "Same! But about guns!!!!
Religious groups: "Same! But its the gays and athiests that are gonna get us!!!!!"
Atheists: "Same! But its the religious people that are gonna get us!!!!"
The list could go on for a looooooong time. But stop and think about what you see and hear in the media, specifically social media, cable news, internet forums and talk radio. How much of it is actual big stories that are really important, and how much of it is non-issues that are designed to to really get the blood pumping to your us-vs-them rage boner? Its a smorgasbord of propaganda out there. Rally around our team because the evil "them" is ready to pounce.
Now stop and think about what youve actually seen in the real world. Ever had a vegan smack a cheeseburger out of your hand? Ever had an immigrant steal your job? Ever had antifa throw a rock at you? Or been told youre not allowed to breast feed? Or been told you cant go to church, or have to go to church, or your church has to host a pride parade? Or any other damn thing im supposed to believe is the next big injustice waiting right around the corner for me? I bet not. Im not saying none of these things have never happened, im saying they almost never happen, and anybody that tells you it is a major epidemic is trying to manipulate you. So step back from the propaganda machine, and go have a beer with your neighbor. Theyre good people, just different.