It could be that he didn't get what he wanted or something unexpected happened that made him angry. Sometimes, even the smallest things can set someone off in a cartoon.
The man in the cartoon might be angry because his favorite team lost a game, or he lost something important to him. There are countless reasons that could cause his anger in a fictional setting.
Maybe he had a bad day or someone did something mean to him.
Could be that he received bad news through the computer or had an argument in an online chat. There are many possible reasons for his anger.
Maybe he didn't get what he wanted or someone crossed him.
Well, usually an angry cartoon man shows it through exaggerated expressions. His eyebrows might be scrunched up, his teeth gritted, and maybe steam coming out of his ears. Also, his body language could be all tense and aggressive.
Could be that someone did something to really upset him. Maybe they took his favorite toy or made fun of him. Poor guy!
It could be that he's angry at someone and pointing to show his displeasure. Or perhaps he's trying to direct attention to something that's bothering him.
It could be that the snow prevented him from going somewhere or doing something important. For example, it might have blocked the road and he was in a hurry. Or maybe it ruined an event he was looking forward to.
Perhaps the cartoon black man is angry because his plans got disrupted or he didn't get the recognition he deserved.
Maybe they had a fight or something didn't go their way.