The freedoms of others should be respected, including the freedom to offend. To willfully and unjustly encroach upon the freedoms of another is to forgo one's own.
Bro can post what they want and you have no say in the matter.
More seriously though, I don't like this "cosplay as a negative Christian" thing some atheists do, either. Let's focus on being rational and moral, not on undoing Christianity in particular.
The Christian nationalist movement in the US is presently trying to unmake democracy and force Christianity (specific denominations to be decided later) into our public circles.
I think normal codes of conduct are suspended for utilitarian ones.
The Mormons and Catholics are so fucked if Christianity ever takes over. That temporary alliance is going to break and the evangelicals will turn on them.