Welcome Olive600:)
The original discussion with your "friend" left out a lot of details. They weren't exactly wrong (low volts could fry your A/C) but they were very misleading. It is not black and white - you CAN run the A/C if the circuit can handle the load. It's the same voltage as you would use at a campground after all.
IMO HiTech gave you the best answer. You need volts to run the A/C.
A typical 120V circuit will drop below 110V under heavy load if the circuit and/or connections are not sized for the job. Your A/C compressor will NOT like that. At 108V it would really start to struggle and may fail.
You COULD run off a 20A circuit but the best solution is to have a 110V 30A (NEMA 30-TT) RV outlet installed at home, then it will behave no differently (perhaps better!) than hooking up in a campground.
MAKE SURE whoever does the install confirms it is a 120V circuit with a SINGLE breaker in your fuse-box.
DO not plug into it if the electrician installs a double breaker - he would not be the first to assume that outlet should be 240V.
THAT would guarantee failure of your A/C compressor and let the smoke out of a bunch of other stuff as well.
This would be a good time to buy a voltmeter so you can check it out before you plug in. Cheap insurance and a useful tool to have around.
And show your friend this discussion - perhaps you can come to a better mutual understanding. It's not worth losing a friend over.
