I think we dislike them because they have a bad habit of stabbing us in the back. Why go to Paris when you can visit Lisbon?
They do that to everybody
Another of their habits is to blame somebody else for every defeat they suffer be it in war or sport
They did that to us Belgian in 1940 instead of admitting that they had the s*** beaten out of them at sedan
Most of us Belgian would not piss on a frog if he was on fire