I'll admit that Fleur was downright obnoxious but I don't think the Weasely's were much better.

I mean they never attempted to *talk* to Fleur about he behavior, instead they made snide comments behind her back and were passive-aggressive about the whole thing.

Plus the 'throwing Tonks at Bill' thing was just tactless to the extreme, plus it was horribly thoughtless of Molly. Did she even bother to find out if Tonks was interested in Bill?