You have to give the guy some credit; Stallman believes in the free software movement, fights for it, and refuses to compromise his rights or values.
He has to compromise at some point. He can refuse to stick non-free software on his computer, but he can't refuse to benefit from the use of non-free software in the computers of the cars and planes that he uses for travel, and he can't refuse the non-free software that was used in the manufacture of many of the products he uses every day.
Secondly, he does not believe that certain classes of software (like in your microwave) need to be free because they are basically part of the hardware. I imagine that if he owns a car, it only has low-level control software for the engine which is basically the same but not, say, a proprietary GPS system.
In planes it is again not an issue: he doesn't own the plane, so even if it had fully free software he would not benefit. I imagine if he ever did get a plane, he would want one with free software, but that isn't particularly pertinent since he will never buy a plane.
So the things you pointed out are not infringements of his rights--they're infringements of the rights of the manufacturer or the plane company. Stallman tries to persuade people like that to stand up for their rights, but that is all he does.