When I was in high school in the early 90s there were a couple of incidents were people brought guns to school. During one, the poor security guard (Mr. Steele, no pun intended) got shot through the leg tackling a student after a gun fight broke out in a crowded hallway during class change. That was over 25 years ago, before Columbine and with everything thats come after its pretty understandable how people might "over react" to seeing a Stormtrooper carrying an E-11 blaster.
I remember as a kid in the early to mid 80s there was a line of toy cap guns that looked and felt real. Pretty sure there was a Luger, a 45 and some small Walther type in the line. We pulled out the red diffusers in the barrels and afterwards it was next to impossible for the average person to tell it between a toy and the real thing.