Blimey magrat He sounds fun. Pass him some ear defenders Monday morning. Failing that an application for Tesco, or tell him to pick my ds up and do a days school run 
That’s not even anything to complain about! Yes I suppose it could be distracting for the driver, but if so he’s in the wrong job!
They are vocal when they have additional needs, it’s something that comes with the territory ffs. And as you say, telling your ds no will only make matters worse. Some understanding of additional needs should come as an absolute minimum for these jobs.
Ds spits down the taxi windows from the inside and smears it all over - her windows are an absolute state, he hits the pa in the back with him if she pisses him off, he’s ripped the taxi drivers licence in half which she had to pay to replace. He’s kicked her vehicle on the outside more times than I can count. He tries to rip her number plate off the back of her car, one day he will succeed, he’s bloody hell bent. He grabs her boobs all the time! He’s even got in the front and rang her child’s school off her hands free. He’s removed the dust caps off her tyres, taken money from her purse, stole her bank card and taxi id lanyard, he fills his pockets as much as he can. She calls him a magpie!
She had her front window open once when she pulled up and after she unclipped him he jumped into the front and climbed out of the front window up onto the roof of the taxi.
I’m making them sound like they don’t watch him properly (they do) but this has all mostly been when I’ve been there when they are back home (and I absolutely do watch him) he could cause havoc in an empty room, it’s so difficult to stop him, thank god I live on a no through road with no traffic so I have time to pick him up and carry him in, usually to much resistance. It’s just what ds is like unfortunately.
She has to have the keys on her out of the vehicle as he locks us out from the inside regularly.
None of them are acceptable behaviours at all, and he really does embarrass me sometimes! But the point I’m trying to make is, they don’t complain to me, they say it’s part and parcel of their job. I always apologise out of courtesy but they are fine. Although once or twice I think he’s pushed it too far with them as they can’t drive off quick enough! Usually every day they say he’s been good despite all the above.
(I fully accept i have an extremely lenient driver and passenger assistant for ds though!) 🤣