APPLES AND ORANGES

When I hear people say "That's like comparing apples and oranges," I know that they believe the opposite, because they are commenting about a topic of great difference, but it is illogical to use the phrase because apples and oranges are similar in many aspects:

1. both are fruits
2. both are planted from seeds
3. both grow on trees
4. both are usually found in orchards
5. both are sweet
6. both are similar in size
7. both can be eaten raw, cooked, or juiced

It would be better to say, "That's like comparing apples to orangutans!" Those are very dissimilar!