Geostationary means the same point on earth is in the same spot, or more specifically the satellite is in the same spot in the sky all the time relative to earth. Geosynchronous means the same spot is in the same position at the same time every day. Usually geosynchronous orbits require some amount of inclination and with inclination and retrograde orbit would make it really difficult to intercept anything as you'd be in a different plane from your "target" in every orbit. Further decreasing your odds of intercept.

Lol. That's like shooting a shotgun 300 yards away from a group of toy army soldiers and saying you're going to hit every one of them. There are more than 500 satellites in either geosynchronous and geostationary orbits. No wonder no one did it.

Orbital mechanics are so much harder than what science fiction makes it out to be. Hence why countries are still failing to reach orbit at all. Much less these perfect rendezvous required to knock a satellite out of orbit.