I tweet at the FBI, NSA, CIA, DOJ, POTUS, etc all the time, and I have an email list with like 3,000 different Politicians and Media people on it. You have a right to say things, and even complain about them and stuff.
And the trigger words just put up Red Flags, Red Flags don't actually mean anything. If I say "Hi Jack" at an airport that puts up Red Flags, but it literally means nothing. A lot of comedy and art is actually about making people see Red Flags, just for fun. So when you were talking about that stuff on the phone they may have actually investigated you or followed you, but when you didn't do anything they realized it was a joke. Or they didn't even notice, because there are probably so many people doing that. Especially since Edward Snowden.