2. That said, on Grindr, people are looking for efficient, convenient, sexual matches made easy. They are not there to tread sensitively and sift through unlikely matches for them (even if that is the kinder way to be). If a "no blacks" user, for example, knows they find Idris Elba hot, but almost no other black men in their experiences meeting people, then obviously they have a really specific standard (albeit unrealistically high). Therefore, it can seem like a bit of a conflict to be looking for the convenience of online hookups yet not taking advantage of filtering sexual attraction preferences the way an actual dating site filters out different interests. Thus, they put "no blacks" because finding an Idris Elba is so unlikely (and not something they are setting out to do) that they would like to narrow the pool to their likely attractions.
People speaking out against such "filters" often seem to overlook or perhaps intentionally exaggerate by saying that the person is locking themselves out of an entire racial category when they could find a really great match that they might like. Or opposers will say the user is making the claim that no one of the race they have eliminated on Grindr is attractive. Neither are the case as far as I've gathered in discussion. They are locking themselves out of a category on Grindr and the like. Not on their soulmate search on a serious dating site. And they are not saying "no [insert race] because none of you can be hot or as hot,"
EDIT: actually some people are saying that, but I mean more commonly- they are saying that the Idris Elba or Ryan Gosling or Mark Consuelos or whatever rare attraction they've experienced in a racial category is too unlikely for it to make the search convenient. Just like dating sites push you to find a good match, hookup users want to only see their likely attractions fulfilled and to filter their contacts in order make the experience convenient. They want that easier match experience of dating sites, but on a sexual and superficial level.