Do you believe that people are responsible for their own sexual orientations?
I find the phraseology of the question odd but, yes, I think so. People are certainly responsible for their actions, however I don't think something someone did sixty years ago before they were even an adult and
hasn't done since is relevant to a current assessment of them as a person.
"Judge not lest ye be judged." The Bible stipulates that one is judged by the measure he judges others.
Why do I care what the bible says? For that matter, why would the Pope? In Catholic doctrine, the bible is just one source of god's word to be taken along side the traditions of the Catholic church and the proclamations of the Pope - now since the Catholic church accepts that Priests have the authority to take confession and give pennance; clearly that requires that a Priest has the authority to pass judgement. Even, if we did take the biblical statement as relevant, the interpretation is highly questionable. One could argue that the Pope is making a statement on the issue of the morality of homosexuality, not passing judgement on any particular homosexual.
No, either you believe its reasonable to judge someone for something they had no control over, or you don't. He does, so its not unreasonable - in fact it's perfectly Biblical - to judge him by the same standard.
Except, as I'm sure you'd find if you enquired, the Pope does not consider homosexuality to be something you have no control over. Nor, I believe, does the Catholic church consider homosexuality to be an unforgivable sin - I don't believe they'd consider a homosexual act commited sixty years ago, and which you have confessed, to be relevant.