I have my rights

I've heard lots of discussion lately on wearing masks.  Should I be forced to wear one or does that infringe on my civil rights?  But yesterday I heard a different example of concern about rights.  My grandson works at McDonalds, and, in an effort to keep things safe the servers are wearing masks (optional for patrons) and plexiglass shields have been put up at the order stations.  Nothing unusual there.  Many stores and restaurants are doing the same.  On the shield in front of the register they have posted a sign requesting that patrons speak clearly and loudly to insure that their order is recorded correctly.  Sounds reasonable to me.  Evidently one customer that my grandson was waiting on didn't think so.  This particular customer got very upset, started shouting (so no evident problem with raising his voice) and claimed that his civil rights wee being violated.  Really? My grandson tried to explain and remained calm while asking for his order but the customer got more and more upset, and finally just walked out.  It seems to me there were no winners in that situation.