Is it bad parenting that I just ate MacDonalds infront of my kids to prove to them you don’t get good things if you fight?

So we had plans to get MacDonalds for dinner cause I hadn’t done the shopping yet and we don’t get take away very often, as we were driving to MacDonalds my kids started screaming at each other.

My husband gave them a lecture about how having take away is a fortunate thing that some people in this world don’t get the opportunity to have as well as many other things, we then decided that they shouldn’t deserve something nice after what happened to my husband and I bought macdonalds for ourselves and the kids ended up having grilled sandwiches for dinner.

I kind of feel bad but then I felt like we got a point across at the same time.

Am I a horrible parent for doing that??