Hi AnnaCz,
Welcome!
Your son's behaviors may have nothing to do with his bipolar diagnosis.
Other factors may be in play. It's also possible his diagnosis plays a role. It's impossible to tell from such a distance. Professional input might be most helpful at this time.
Do you speak with his therapist or pdoc?
Sounds like a family meeting -- sharing of info -- may be very helpful.
Please let his therapist/pdoc know you feel he's aggressive.
Stay safe.

WC