If you were female then I'd understand that it's probably a sentiment shared by many chics (and many have voiced as such) but as a guy you wouldn't really know that chic's priorities when it comes to a date and as someone has rightly mentioned above, the circumstances under which they were having that date!
A guy who is driving a lexus probably wears suits the whole week and when most guys are on leave, that's how we dress. For all you know he could have left the house like that to run some errands, catch a pint as his car is washed then go elswhere, only for the chic to call him up.
That said, I have heard from many female quarters how dudes should style up in the dress for a date department so your point remains valid
BEER IS LIVING PROOF THAT GOD LOVES US AND WANTS US TO BE HAPPY!