book could have called him out without rushing over to him and getting nose-to-nose. literally no one has said he should’ve run away (at least I think so - lots of posts from people I ignore).
Book did not rush over to him. He had his hands out asking WTF? While he walked in Jokic's direction. Jokic propelled towards Booker and shoved him away.
Watch, starts around 2:12
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After watching it, again, I am still not entirely sure why Book was T'd up. Jokic made the dirty play and was the aggressor with Book also. How he avoided a Technical with his flagrant is questionable. Its likely they disregarded it since they were tossing him anyways.