How to stop my brother from using farts when he gets mad?

My older brother knows that he will get in trouble for farting on me. But when I do something to make him mad he will either fart a lot in his closet and lock me in it (happened befor) or fart in my face at night and think it is funny. If i ask him to stop then he will just say I should of stopped doing whaever i was doing. (i dont do bad or phycical things its just that we get in alot of fights and dont get along) I can't ask him to stop and i can't tell anyone because I did something to. Farting is his revenge and he thinks it is funny. What can I do to make it stop?