As asumag.com reports,
The boy was disciplined twice for wearing pro-gun clothing, according to the lawsuit.
He was first disciplined in November 2017 for wearing a shirt from a local gun store. That shirt depicted the store’s logo, which shows the silhouettes of a rifle and handgun.
He was again disciplined on March 12 for wearing a shirt promoting the FirearmsPolicy Coalition. That shirt features the words “Don’t Tread On Me” and a coiled snake. It also includes references to the Second Amendment.
At least the school could argue that the 8th-grader had the outline of a rifle on his shirt the first time. But in March he was wearing a shirt that only had a pro-gun message. Like this:

“The shirt did not promote or advocate illegal activity; it contained no violent or offensive imagery; nothing on it was obscene, vulgar or profane….And yet (the student) was prevented from wearing his shirt based on school officials’ disagreement with the message they believe it conveyed,” the lawsuit contends.