It's perfectly okay to say that you don't think a certain ship would be a great couple, but in response to a lot of posts saying that some ships "couldn't actually happen" or "doesn't make sense"... Anything is possible!
Opposites attract. People can change. One thing that is often helpful in understanding a ship is asking people why they ship that couple.
Some people come up with very convincing points- it's actually how I ended up shipping Dramione and Lover in the first place. It's good to try to keep an open mind about all ships, even those you don't really like or understand. Sometimes the best ships are those with the most interesting stories, including the heroXvillian ships.
(By the way, I hope this didn't seem defensive... I wasn't offended by any of these statements, I've just seen a lot of these lately and wanted to respond to them all at once.