I find that knowing others don't like stuff that I do like, and knowing that I won't be offended if anyone says they don't like something that I do, empowers me to just be honest when evaluating other people's stuff.
Also I don't think there is any "good" or "bad" taste, every individual has their own taste and it probably contains a spectrum of things that any given other person would find "good" or "bad", but the most important thing is that the individual is true to themselves and doesn't let the tastes of others diminish their enjoyment of what they like.