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I have owned a ~2012 metal macbook pro in the past and felt the buzzing as it was charging, and would not call that effect a shock (there was no spark, it never hurt, I never got burned or needed a doctor's visit), so if you are being shocked then your situation sounds worse - and different to the buzz most people are talking about with respect to metal macbooks.
(As a kid there were some field telephones[1] in the house, they are ex-military phones you wire directly to each other and they have hand-wound generators which power the other side to ring; we used to play a game of "how long can you touch the contacts while winding it" - that was uncomfortable but had no safety effects that I know of (no burns, bruises, doctor's visits, etc). Even being shocked is not automatically unsafe, although it may be unpleasant and undesirable from any consumer product, let alone premium ones).
[1] https://duckduckgo.com/?t=ffab&q=field+telephone&iax=images&...