Not only rude, but I will raise it to rude and mean. BIL knew it annoyed you and then he did it again just because he felt like it. This makes your BIL a mean, self centered, thoughtless, bully. As to his fake "oh I'm in trouble" reaction, he should really spare us the fake "surprise" reaction.
These are not the actions of a nice person. He took your nice gesture and made a mockery of it. IMHO your BIL is a jack@@s and seems to take pride in that fact. Be thankful however because he has finally revealed his true nature to you, so now you know just who he really is.