Depends.
If someone has done something to me I can normally move on from it.
If they do something to my children or husband I hold a grudge till the end of time.
There's a bastard of a neighbour I haven't acknowledged for about 10 years because he was really rude to my husband. My husband makes small talk with him quite happily and tells me to not let it bother me because this man is rude to everyone and clearly has issues.
I don't give a shit. He was breathtakingly rude to my husband while he was actually helping this man!
It's a small development of older people's homes and my husband had gone over to salt all their paths so they would be safe. This bloke leaned out his window and hurled abuse at my husband for using their salt that their service charge paid for.
Erm. He was using it on your paths you arsehole. He's the reason you can actually get out of your door after snow without falling on your arse.
They have the community transport bus they need to be able to safely get to etc.
I told my husband to never bother in future. Let him fall.
But he's a much better person than I am and he still salts his path when he does the others.
Not only that but he goes to fetch the salt from the box at the end of our road rather than use 'his'... To salt HIS PATH!! It's ridiculous.
Meanwhile the nasty bastard is dead to me.