He is not against Croatia, if he could guarantee he would turn back the 2008 and 2004 New members.
There's no point in getting emotional about articles like this, the Dutch nationalists actually are very ok on Croatia, and they did a compilation against turkey being in EU, and also about Cyprus – that it is not Turkish.
The same like the English Defence League, gay-rights is not a problem for culture survival…. unless people start getting scared that because they show some gay on TV that all they children will be gay and thus no more European children
…. but that is just paranoia.