By way of update, in recent days I have encountered numerous times a particularly annoying kind of fallacy. If I had to categorise it, I would describe it as a kind of appeal to authority. But, unlike most appeals to authority, it does not appeal to scholarship, so much as the experiences of a particular people group. This is particularly common when it comes to issues that concern the hot topics of social justice: feminism and gender equality, race, sexuality etc. In each of these cases, there are some within these people groups who seek to represent themselves as an oppressed minority (I've even heard feminists describe women as a "minority", oddly), or else they make some allegation of social injustice (racially motivated police brutality, campus rape culture, gender pay gap, and so on).
Whatever one may make of these individual issues, very often what I see is a tendency on the part of such minorities, as well as the defenders of their cause, to claim a certain unchallengeable authority, merely on the basis of their personal experiences. For example, when feminists claim gender discrimination, or a given ethnic minority claims racial discrimination, the minority in question will often seek to silence any dissenters on the grounds that they have no right to talk about the issue, not being part of the minority in question. This is especially common when allegations of systemic or institutionalised discrimination are made: the line is "if you are not black/a woman/gay/transgender, then your opinion matters less than those of the minority itself", or perhaps even "only the opinions of the minority in question should be heard".
This seems to me to be a particularly dangerous kind of appeal to authority, politically speaking, as it seeks specifically to silence dissenting voices. While individual experiences are of course valuable, they are not the be-all and end-all, especially when claims of widespread, systematic oppression are made.