The original comment correctly pointed out that you can make fictitious forces vanish by selecting a suitable frame of reference (which will not be a inertial frame of reference), he incorrectly stated that you can do the same with gravitational forces which you can not because they will at best vanish locally.
The response to my fist comment I could not fully understand but the last part of it sounds to me like it implied that a frame of reference only comprises a single point in space which of course is not true.
All in all my objection was the you can not treat gravity like fictitious forces which is an understandable and easy to make mistake if you base your reasoning on the simple elevator gedankenexperiment. I have absolutely no objections to the way the equivalence principle is introduced to people. So I am not really sure what we are arguing about, it seems to me that we - at least mostly - agree on the matter.
The response to my fist comment I could not fully understand but the last part of it sounds to me like it implied that a frame of reference only comprises a single point in space which of course is not true.
All in all my objection was the you can not treat gravity like fictitious forces which is an understandable and easy to make mistake if you base your reasoning on the simple elevator gedankenexperiment. I have absolutely no objections to the way the equivalence principle is introduced to people. So I am not really sure what we are arguing about, it seems to me that we - at least mostly - agree on the matter.