I can't say I've had any such problem with littlun, but his autism isn't that invisible. I suspect that bigun would be targeted more if we got around to applying for his pass, though. We've had enough problems with him being a tall 13 (now 14) year old, but not with gne drivers. He can't speak to people he's not really comfortable with at all, so would really struggle if he was challenged so aggressively.