Well if it is a Qatari with a four digit number plate then there isn't a lot you can do.
pity you couldn't take a photo and just post it up.
everyone should have a good qatari friend to ring up and ask advice of. my friend was shunted by someone who claimed to be qatari. as soon as we got a qatari friend on the phone we were told he was egyptian and the attitude really changed from belligerance to grovelling.
unfortunately depends on who and what they are driving.
and the worst worst driving is coming out of football matches