Most of Europe applauded the events of the Revolution as late as 1791. Their relations to it only began to sour once it became clear the French were taking a turn for the far more radical than anyone had expected and the agreements of the Estates-General dissolved.
Avignon was one of the main things that really damaged the relations with the rest of Europe. After August 10th, 1792, and the storm of the Tuileries Palace any remaining sentiment for the French dissolved. The Russian and Swedish opinion had been shattered earlier.
Interestingly, from what was seen, the Prussians didn't really care that much about what the French did. They meekly agreed to a peace in the west allowing French forces to run rampant over the Rhine so that they could focus on asserting their authority on Poland and getting Gdansk and Posen, as well as a number of other areas, from Russia in a new Polish Partition.
So Frederick may not have thought very much at all of it.