Both chocolate cake and peanut butter should be on the menu and we should be able to freely choose between the two at our own discretion or even have both if we so desire.

Where the line is crossed is where the chocolate cake eaters try to violate the rights of the peanut butter eaters and forbid them to eat peanut butter and declare they may only eat the chocolate cake. Or when the peanut butter eaters try to violate the rights of the chocolate cake eaters and forbid them to eat chocolate cake and declare they may only eat peanut butter. Even worse when they side with terrorists willing to use terror of force and violence to enforce such an edict or themselves stoop to that level.