One of the most irritating things about mothers.
Mothers (can) have many irritating behaviours. Meddling, knowing it all, worrying too much, create embarrassing situations to name but a few.
But the most irritating thing about mothers is that it is next to impossible to hate them, as all of the above and the rest of it, is done out of love for her child.
I know there are exceptions, mothers who purposefully hurt their child(ren). But I like generalisations because it makes my life easier.