they poke and prod you or make weird noises or generally act like an attention deprived 8 year old, and when you ask them to stop they carry on, until you lose the plot and then suddenly it's all your fault for over reacting even though you've spent the last hour being wound up by a manchild
they have lived at home for a good chunk of their adult life, and have no idea how a washing machine, dishwasher, iron or dryer works
their cooking skills extend to nuggets and chips.
they leave their bowls, plates, dirty clothes, wrappers around for somebody else to pick up.
their still getting driven around, almost like a school run by their elderly parents even though they're pushing 30.
they expect you to cook, clean, raise children and run their life, because they work. even though they only work 2 days a week
spends more time on game console than with family
throws a house party at their elderly parents house at the age of 27 when he's lived away for over 2 years, thinks every one is over reacting to be furious with him when he was found still drinking at 7am with various people strewn across the floor. made other people clean it up as he went to bed....
can you tell I'm bitter? those are my red flags anyway. there's more but my phone is dying!!