The bug
Bees that have been summoned to have the NBT tag NoAI:1b still can get angry, either if they are punched directly or are indirectly made angry by other bees nearby.
To reproduce
Run
/summon bee ~ ~ ~ {NoAI:1b}Switch into Survival mode
Hit the bee
→ ❌ The bee gets red eyes
Additional note: if a regular bee (NoAI=0) gets hit within range of a bee with NoAI=1, the NoAI bee will also become hostile alongside the regular bee.