But of course, now that Stubby's here, everyone's going to agree with him because he's the most brilliant of us all.
That's probably not saying a lot, unless resident genius Benny shows up.
Anyway let's put this to rest. Speaking of papal infallibility, one of the rare recent cases in which it was invoked was on this very issue. Pope John Pual invoked papal infallibility on the matter of female priests in 1994, and in 1995 the Congregation for the Doctrine of the Faith backed it up just for good measure (the Pope is considered infallible only under special circumstances, but the Church ecumenical council is automatically always infallible, so this is a special kind of DOUBLE infallible called "set forth infallibly by [both] the ordinary and universal magisterium").
Pope John Paul II wrote:Although the teaching that priestly ordination is to be reserved to men alone has been preserved by the constant and universal tradition of the Church and firmly taught by the magisterium in its more recent documents, at the present time in some places it is nonetheless considered still open to debate, or the Church’s judgment that women are not to be admitted to ordination is considered to have a merely disciplinary force. Wherefore, in order that all doubt may be removed regarding a matter of great importance, a matter which pertains to the Church’s divine constitution itself, in virtue of my ministry of confirming the brethren (cf. Luke 22:32) I declare that the Church has no authority whatsoever to confer priestly ordination on women and that this judgment is to be definitively held by all the Church’s faithful (OrdinatioSacerdotalis 4).
So that's it. Anyone who believes in female ordination places themselves outside the Catholic belief. There is no weasel room on this issue. Your former priest might debate the pros and cons, but if he actually believes in female ordination then he is apostate, end of story.