Hating songs out of tune and how to live after hearing one

To introduce you, when I was 16 I joined a music class in my school. There, my music teacher taught me a lot about something I love, but I'll never forget how he said to me many times that I had a "musical ear", because of my knowledge of tunes and because I can know inmediately things like the scale a song it is written, just hearing it (despite I can read music).

Along with that comes a great problem. I can't stand music out of tune. I can't stand (most of times) when the singers turn down the tune of their songs to "sing it easily"... it's a pity! Sounds really bad for me. Also when people upload videos with background music (or lyric videos, etcetera) and go down or on with the music tune to avoid copyright disclaimers... I need to change the video or put the video on mute.

Please, listen to this songs with low volume to avoid ear pain

Original tune:

Low tune (the singers were in a cold that night, but I dislike it anyway):

I know this can be a bit thick for you, but believe me that I try always to find my favorite songs in the original tune, because this can even put me angry. It is one of the things that wake up my indignation. Music is always a piece of art so, please, don't kill it like this.