No, it's not a reflex to immediately be triggered by saying the obvious. People are triggered because they understand satire and know there is an underlying premise to the simple statement, "it's okay to be white".
The statement hits on several levels. Obviously, it is okay to be white, everyone knows this and agrees with it, that's why it needn't not be said.
1. So, why is it being said? That is the first question people ponder and none of the reasons that come to mind are positive. People don't just automatically become angry because they want to get angry. That makes no sense. People go through a process of understanding what things are supposed to mean before they react. Just because you cannot understand why they get angry, doesn't mean their reasons for getting angry are not legitimate or warranted. Maybe you just don't get satire.
2. It's being said to trigger people who believe, "black lives matter".
(A phrase that shouldn't need to be said yet still triggers many people!) People have vigorously worked to delegitimize the very fact that of course, black lives matter!
3. It's being said to trigger people who believe, Alt-right/skin head, low life's are finding a voice and coming out from under the rocks they should still be under. Because of course, if you don't like the phrase, "black lives matter" and want to cut that down, you just might like the phrase, "it's okay to be white". You see, people can rationalize why something is being said without being told why it is being said! All while still understanding that of course, it's okay to be white.
4. It's being said by white people who feel the white majority is somehow being threatened and not getting a fair share any longer in America. Again, people who are tired of the LGBTQ crap and rights for everyone while the whites seem to be getting overlooked, I get that.
Still, nobody likes it or appreciates it when a complete stranger walks into an elevator and loudly farts all over everyone. It's just rude. Can that stranger then strike up a conversation and try to convince anyone in the elevator to their way of thinking while the stench is still in the air? No. They blew it, so to speak.
So, the bottom line is, this is bullshit. Don't shit on people to prove your point. People won't listen to you. All it will do is delegitimize your ideology further and make people want to steer clear of you.