"And ye shall be hated of all [men] for my name's sake: but he that endureth to the end shall be saved" (Matthew 10:22). All other filth is allowed to be worn or almost all but let Christianity be displayed and all kinds of hatred and bias is brought forth. Keep in mind, we are not advocates of wearing such shirts. We do not believe we have to wear our Christianity on our bodies but "[let it be] the hidden man of the heart, in that which is not corruptible, [even the ornament] of a meek and quiet spirit, which is in the sight of God of great price" (1 Peter 3:4).