<we can and must promote or exclude different governments on this planet, in all kinds of international debates, forums, activities, initiatives, due to the "structure of their government".

Every country has the right not to agree with another or a number of others, true.
However, no country has the right to exclude another one on an international matter, just because an international conference takes place in that country. The UN is in New York, but the building is I'm sure, not US territory. And if the UN is located in New York, it's most certainly, because the US president, at the time, strongly lobbied in its favor.
But to "exclude", is that constructive? Will that help solving problems? I'm sure not!
If an international matter involves fathers (from a non democratic country) taking their children away from their mothers (from a democratic country) and hiding behind customs favoring the father in their country, I"m sure it won't help the mother's cause.
Many Belgian mothers had their children kidnapped by their Maroccan father and the mothers were unable to ever see their children again because the Maroccan law gave all the rights to the father;
There have been discussions, there are possible visits and the children can now visit their mothers but I'm not even sure it's completely solved.
The best way never to solve the problem is to exclude Marocco from those discussions.

There will always be involvements of non democratic countries in all kinds of matters, if only by their citizens. Must we exclude them because they are humans and have rights as humans, not just citizens from that not respectful country? Several months ago, there was the Elian case (the small boy from Cuba who survived from nearly drowning with other Cuban refugees); the only way to have solved this crisis was as has been done: return him back to his father. His father had no wish to leave Cuba and that's his right, of course.
And another thing: some Western Europe countries have been more than displeased by the extreme right participation in the Austrian government and have expressed it loudly.
It turns out those western countries also have a more and more powerful extreme-right faction.
It's not always a good idea to give lessons, as it might very well backfire.

Raoul