DH had an argument downstairs with the two DC concerning games console. When eldest DC came upstairs I attempted to speak to him about what was going on and DH decided to interject 'his side' of the story. I then got cross with DH for getting involved with a conversation I was having with DC about it - I wasn't taking sides, was just discussing the issue.
AIBU to get annoyed at DH for getting involved in the conversation I was having with DC (it ended up in another argument).