After learning that soup is sterilized in the canning process and doesn’t actually need to be reheated, I pretty much always just eat it straight from the can. It saves dishes and microwave time, and makes it extremely easy to just grab and go if I need something for the road.
But, somewhat understandably, I haven’t met anyone else who does this.
Cold soup from a can sounds post-apocalyptic. I heat it and have it in a bowl, possibly with croutons or a slice of buttered bread.