Where do I start?
Well first of all you have to make a distinction between the outside world and this board. Maybe I'm wrong, but this board has more flemish than walloon members, so Justine is a bit disadvantaged in that aspect. And on this board everyone has a fav and that will always create quarrels.
There are two Belgian players in the top 5 so it's inevitable that particularly those two are compared with each other. Through the years it has become clear that Kim and Justine are really opposite in almost everything. Justine isn't as good at socializing like Kim is. I think her true friends on tour are Amelie Mauresmo, Nathalie Dechy, Sandrine Testud (before retiring) and other french players. Nathalie and Sandrine were present at her wedding so that tells a lot.
In the WTA world almost everything is done in the English language. The most important press conferences, interviews, victory speeches etc. The least you can say is that Justine isn't a great talker and it always seems to me she hates doing interviews. The only place she wants to shine on is on the court and the other things that come with the job are clearly ballast for her.
But the real turning point is of course Serena's interview after the french open semi this year. It was a very different Serena from after her victory over Amelie. Like we all know she cried because of her loss and accused Justine of "lying and fabricating". Imho Justine didn't do anything wrong at the FO. It was just an "unlucky" series of events in a split of seconds. Serena was about to serve, the stupid (Belgian part of the) crowd grew extremely noisy and so Justine held her hand up to await the silence. Serena missed her first serve, umpire said he didn't see it and Justine wasn't asked about it. Of course in hindsight it would be better that Justine approached the net and explained it. But I never see topplayers do much talking to the umpire during a match, except to complain about a call. So after the french open most Serena and Venus fans turned against Justine, which is understandable. What your fav says, goes.
And finally in the future Justine and especially her coach Carlos should be more careful what they say, also in Belgian interviews. I've noticed the world of tennis journalism is very small. So every sentence that comes out of your mouth is picked up, sometimes taken out of context, sometimes translated wrong and travels to the other end of the world.