Oh I'm sure Lucas just dismisses us all as just a bunch of nitpickers who are blinded by childhood nostalgia and can't view the prequels objectively, and that the huge theatrical grosses speak for themselves.
While I agree the Prequels are dreck, it's a fair argument for him to make.
The Prequels and the merchandising did very well.
So, yeah, in a way, the grosses do speak very clearly.