Jobs does not spread make these comments out of spite.
Apple have put a tremendous effort into developing a closed platform where they vet every application that their users run. It is not in their interest to allow this to be bypassed by making Flash available on the iPhone and the iPad; therefore they discourage its use on their desktop platform by ensuring that the resulting user experience is unpleasant (that is, buggy and slow).
The public comments from Jobs about Flash is another prong of this stragegy: Apple is leveraging their fanatical fanbase to spread anti-flash propoganda.
I swear that the 1984 commercial is growing more and more ironic every day...