Is it fair or appropriate for one country to judge the cultural practices of another? Why or why not?

I suppose it depends on what you mean by
"judge."

It is in my opinion totally fair for one country
to think whatever they want about another's cultural practices.  After all, we are all
entitled to our opinion.

Now, do you mean to ask if it is
fair for one nation to try to stop another's cultural
practices?  I would say yes again, as long as the country is not doing something like
invading the other country.

For example, let's say we want
to use our money or our policy to stop "female circumcision" in other countries.  I
think it is fine for us to do that as long as we are giving the country a choice -- you
can stop that and get our aid or you can keep doing it and not get our
aid.

There is no reason that one country should have to
help another country do something the first country thinks is morally wrong.  As long as
you are not being violent, I think it's fine to judge and/or try to stop other countries
from doing things we think are wrong.