There's a lot of overlap. But without extensive therapy ODD-like symptoms that progress into adulthood usually get worse as the person experiences increasing difficulty trying to function in society, then they are diagnosed as IED and/or anti-social personality disorder, which is often diagnosed by a prison psychiatrist (this is very common with kids who had a CD diagnosis as well).
I'm also not convinced that Pat has ADHD, he's just a retard. Like most lolcows, Pat seems to love the labels that have been slapped on him because it excuses his inability to function as an adult:
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Adults with ODD don't usually accept that they have it. They typically have a fixation on society ('the man') bringing them down, and believe that they've been slapped with a convenient label or a nonsense diagnosis. As I said before, as long as you're a democrat Pat will happily accept you as an authority figure. That is not ODD.
I've never met him, but from his behavior on the internet I'd diagnose him with OCD and then most of the cluster-b personality disorders.
He's also a fat faggot with bitch tits.