He was just expressing his opinion based on a grey area so why call him a liar? Even the link you point to says, "Vehicle segments for cars in Europe do not have formal characterization or regulations. Models segments tend to be based on comparison to well-known brand models" so this means there is a lot of leeway for segment classification. The models mentioned in the Wikipedia examples are the opinion of the writer only and are not objective facts. Perception may also vary between Europe and Asia.

You should learn how to reply politely in a discussion forum instead of replying rudely to those whom you don't agree with. Posts like your can easily start a flame war for no reason and end useful discussion and sharing.