The airy dismissive is a rhetorical device used by smart alecs about people whose works you have great respect for. Three instances I've come across recently:-
James Heartfield in Spiked describing Orwell as a "Cold War propagandist".
Guy Rundle also in Spiked describing Clive James as a "former clip-show host".
Tony Judt in The New York Review of Books saying "no one who reads it will ever take E.P. Thompson seriously again".
The airy dismisser picks up someone's writings, weighty both in volume and in substance and with a knowing smirk chucks them aside like a CD of 1995 club anthems. He reduces a world of wide variety into a Hitchhiker's Guide to the Galaxy entry patronising the planet earth as "mostly harmless". He is the intellectual sound biter.
The airy dismisser is a bright fellow pursuing a career in journalism or the academy. You will recognise the airy dismisser as after reading one of his put-downs of authors you admire you will want to punch him.
Lord dismiss him with our curses.