Yes, the chorus sounds harsh relative to the rest of the song, which is likely due to the producer (or recording engineer) having overdriven the recording amplifiers to give the recording a more edgy sound - a common practice in pop music.
A couple of general comments: First, I wouldn't use Youtube videos to judge your equipment by. Instead, use a CD, LP, lossless WAV, AAC or (verified) 320kHz .mp3.
Second, again, heavy metal tends to be recorded to....well, let's just say less than audiophile standards. Sadly, there's little you can do about that other than to just enjoy the music the way it is.
Third, there're basically two fields of thought in audio: 1) the so-called straight-wire-with-gain approach, which, in absolute terms, means that your audio equipment neither adds nor detracts from the sound the producer/artist heard in the recording studio when they made the recording. In this case, the goal is to hear what's in the recording, warts and all; or 2) the tailor-the-sound-to-your-liking approach that says you have to find equipment that, together, produces a sound that, while perhaps not 100% accurate, allows you to modify (the adherents of the first approach would say distort) the original sound to tailor it to your liking. This latter approach is the reason why most audio systems have frequency response and other controls that allow you to modify the sound.
The bottom line is that unless you want to broaden your musical tastes, I would just enjoy the music and stop worrying about the warts it contains.
ok thanks that means it was not my headphones.