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It's only sound coming out of a speaker. There are a few things I can't handle (basically Edith Piaf, K-Pop and other teenage-girl-oriented pop).
Some of the less well done 'extreme' metal fails because it reaches the level of self-parody and makes me laugh, rather than not being able to cope.
I am an 'album oriented listener' who enjoys listening to a curated (to use a very in-vogue term) collection of music, but when I do I enjoy some light and shade. Some of the music you refer to feels boring, rather than relentless.
Personally I think something like Sabbath Bloody Sabbath, 20th Century Schizoid Man are 'heavier' because of their use of dynamics.