The thing with music that gets posted is you don't know it's significance to the poster. If I post something like Muse it's because I find them creative, original and I like their sound, and figure maybe someone else might too. If others are dismissive, so what, I don't care.
If however I post something of say the punk or new wave eras, (particularly bands like The Stranglers) it's likely of greater significance to me, and it was likely part of the background music during my formative years. Outright insult or dismiss it, and... er, well, it's not quite insulting my mother, but there's a risk it will be taken far more personally, almost like someone is insulting a facet of one's identity. And the trouble is when say I post either of the above (or all the other bands) people don't know whether it's a band of passing interest, or a minor er, almost part of my identity ... hence the risk of a spat getting stoked. And I expect it's the same for everyone else posting in that topic, it's a bit of a minefield
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