Ok to answer my own question I think he's mad because tsurumi manipulated him into throwing away what was special to him (igogusa) while tsurumi has been holding onto his reason for living this whole time and never told him about it-- not to mention that this personal grudge has secretly been his main motivation, and that it's not something big and noble.
Wondering why Tsukishima is mad.
Ok to answer my own question I think he's mad because tsurumi manipulated him into throwing away what was special to him (igogusa) while tsurumi has been holding onto his reason for living this whole time and never told him about it-- not to mention that this personal grudge has secretly been his main motivation, and that it's not something big and noble.