My son's classmate snubbed my son, so I think I'm not going to invite him to my son's birthday party.
What would make you want to snub him back? He's only a kid.
I want to teach him a lesson so he won't do anything like that again.
It's petty to hold a grudge against a child like that. People who seek revenge instead of forgiving or letting go, tend to feel worse in the long run.
Wrong, revenge is the sweetest thing there is.
I don't think that's the case. Getting revenge on this kid isn't going to make you or your son feel better. You should just let it go, and invite him to the party.