This asshole likely would have made a scene regardless of who was helping them. Also, blocks can be very unnerving/confusing/concerning to a listener who has no clue why you are pausing in odd places, looking away, etc. most people are quietly concerned, but everyone once in a while, you’ll meet a loud asshole. The best defense is to disclose as often as possible. At home, in front of mirror, watch yourself doing voluntary repetitions. Then, speak on *normal exhales* while making eye contact.