I'm thinking it will be okay if I tell off an old man for cutting the line at a grocery store
Do you think that's a good idea?
I think he deserves to be told off
You have the right to tell off someone but are you sure you want to do that? It will just make everything worse than it already is.
I waited in line for a long time before he cut the line, and I just want to cause some mayhem
Are you sure that he even intended to cut the line. Try to understand that older people can misjudge certain situations and make mistakes. I think you would feel less frustration if you just overlook this one man.