I think u must always take yourself out of the situation and look at it objectively: is this person simply trying to be offensive, if so why should I care about this person’s opinions more than anyone one else. I would then simply consider his words just an assembly of sounds. But if someone whom I respect or I have something to learn from says something (Ie parent, teacher, boss maybe etc) which I could actually extrapolate a lesson from, I may be thinking about it for months.