Always have your antenna up, because bullying is omnipresent among human beings. Nevertheless, don't fight every fight with bullies, and don't try to win all the fights you pick.
• Is this important?
• Is my anger appropriate?
• Is my anger modifiable?
• Is this worth taking action?
• How do I see myself in this? (It's best to assess and confess to your contribution to the problem.)
When you answer those questions, you might wisely choose to ignore the situation. Sometimes it's not worth the time and action.