It depends... If someone did upset you but had no intention, then there is nothing to forgive.
If the intention was to upset you, Then it’s either out of love or hate
So, the real question is, would you forgive someone who hates you?
I say NO
Forgiving is overrated. Many people ask the same question, but deep down everyone know, we do stuff because of reason, everything we do, is because of some kind reason. We call other people hypocrites and egoists but everything we do is motivated by some reason, even when you donate to charity, we are being egoists. We do good to feel better about ourselves and it isn’t wrong to like helping others, it’s about the reason why we do this – to feel better about ourselves, which is the definition of egoism. Reason, point, motivation is why we do stuff.
So what would be the point in forgiving someone who hates you?