“A lot of people doubt me, and my family semi-doubt me, you kind of have a chip on your shoulder and you just want to prove everybody wrong,” he said.
“I’ve been going on my fourth year and things haven’t changed. People still say the same things about you. It’s been like that since high school. It’s been like that since college.
“I just keep chipping away and keep doing what I do.”
Celtics coach Brad Stevens has noticed Sullinger’s marked defensive improvement.
“I told him I think it’s the best defensively he’s played since I’ve been here,” Stevens said.