You obviously have a newer phone than me!
Here is some info about how to change the
default behavior concerning HEIC. Hope that helps and calms your attitude a bit. Life is too short!
Also remember, your iPhone has a microphone! Do not talk disparagingly about it when it is on or close enough to hear you!
For already transferred HEIC images, you might just try opening them in
Preview. It can convert many formats into several others, including HEIC. So it may be able to work the other way round.
If you don't have an up-to-date version of Preview, I know where you can get a reduced price one... just send me a check for $19.95 and I'll send you the file. Free shipping within the contiguous US!