When did it no longer be okay to express unpopular political views?
I find such reasoning absolutely ridiculous. Personally it brings me great sadness that the ideals of free speech - the ideals, not the legal meaning - have been so happily stomped on.
It's not good, it's not healthy for anyone, and I'm wondering how long its going to go on for.
You have to keep in mind, that for the most staunch Trump opponents, any mention of him is likened to a personal attack, they honestly believe that supporting him is on the level of full blown white supremacy and fascism.
And in that climate, even thought it goes against my principles, I would advocate for everyone to just keep their political leanings to themselves at all times in these "professional" gatherings where it shouldn't matter where you stand politically. At least until things calm down.
I would love to see hostile tensions like these die out online very soon.
However, you're being disingenuous. He didn't wear it at a large event, he thought it would be a fun idea to put it on in front of Trump Tower and share a picture of it with his friends on social media. That's something I might even do as a fun tourist picture, and I really don't like Trump.
This conference is not banning him for conduct at the event, they are banning him for an innocuous social media post on his personal twitter account, a week before the event has even begun. They are just policing the political views of attendees. That's what people have a problem with.