If Karma is a thing, then wouldn’t wanting someone to experience bad Karma also get YOU bad Karma?

He insulted me’ -this knowledge binds one with terrible demerit karma.

A person gets the people around oneself not by own desire or wish, but as who s/he character-wise is. That's perhaps the first cardinal rule of Karma.

The consequences of our actions take hold of us quite indifferent to our claim that meanwhile we have "improved".

My Karma ran over your dogma.

"Your problem isn't karma, Sheldon, it's attitude!" "Well, Lonnie, maybe it's attitudinal karma !"