Why does my son have to take offense to everything?

His graduation is coming up and I invited his brother along with his partner and children. My son rang me up to tell me not to invite people without his consent and said if his brother was to be there it was for him to offer him one of his tickets. He went on a rant how they've never got along, only in the... show more His graduation is coming up and I invited his brother along with his partner and children. My son rang me up to tell me not to invite people without his consent and said if his brother was to be there it was for him to offer him one of his tickets. He went on a rant how they've never got along, only in the past few years they have and he would have been happy to invite him but as his gesture and not mine? Then went on to tell me it's not about me and I'm a guest too.
Update: University...
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