Yup, been there. I was advised by my boss on my first day to ignore him, as this person was at a different department. When I had some work to do with this person I acted as professional as I could. Hope that helps.
A bully, he is still working at that company, and the best workers have quit...
Yes. He hired me, I had his job after one month. Things he did included:
"Rewrite" our Roku application an hour before an investor demo, make me fix it with about 30 seconds to spare, and then blame me, over speakerphone, to his/our boss, who invited me to listen.
Yell at me about his family while drinking beer at 3pm
Smoke 4 joints in a row during a late-night grind, and then emphasize how /he/ did the work last night at the morning meeting.
Literally delete my code (No VC) minutes after I shipped it.
A bully, he is still working at that company, and the best workers have quit...