1. The coward's way of saying "I don't personally like it", instead of admitting it.
2. The internet's way of saying "I don't personally like it", instead of admitting it.
3. A misattribution of taste based on confirmation bias, where others are wrong for liking something, whereas the user of the word perceives themselves as "right" otherwise for not liking it.
Something that is excessively hated, regardless if it is actually good or bad. It can be overhated by one group of people and overrated by another; see bandwagon