I actually don’t understand why your brother would want to meet a girl or even talk to her if he was not interested in the first place.
It is really not that uncommon in traditional communities that you shouldn’t meet the girl if you are not truly interested. The girl is not any toy ki shaadi ke naam pe ghar ghar jakar ladki dekh li family pressure mein, baat bhi karli on several occasions, and fir bolo sorry yaar Mai toh family pressure mein hun.
Completely understand the girl’s father if that’s how traditional the community they belong to thinks. Doesn’t make it right but you should also try to understand and not be disrespectful.