I was wondering when a thread about Otherkin/Fictionkin/St arkin/TransFat/Transra ce individuals would pop up!
I hope I don't sound overly offensive here, so I'll try to explain my answer carefully (AKA warning: super long post ahead).
I do not believe that Otherkin are actually what they feel or claim to be, but in some cases it is clear that they do strongly feel this way. I take them seriously in that I do believe they feel trapped in the wrong species, but I do not think that it is what they are actually suffering from.
I find 'kin extremely fascinating. I follow a number of 'kin-friendly blogs, somewhat for the lols but also because I find their stories of self-discovery incredibly interesting! I could read about their experiences for days. It's very cool how phenomena like this spread, and how far back they can be traced.
I feel really bad for many 'kin individuals because they seem very sad. Often they seem to have a rough time with their family and peers even without their 'other' identity, and the sense of belonging they get in the 'kin community is a great, stabilizing thing! I know a few people who have really become much more happy after connecting with some of the blogs I follow and befriending people who feel similar to themselves.
I do not believe that Otherkin experience the same discrimination as LGBTQ individuals. Although one argument is that 'kin are not as widespread or numerous, I can think of dozens of examples of LGBTQ people being beaten, killed, and raped because of their orientation, and exactly zero deaths caused by anti-'kin hate crime.
Also, while Otherkin are at least slightly realistic, Fictionkin/Fictives (individuals who believe they are fictional characters such as Sherlock Holmes or KITT) and especially
Starkin (those who believe that they are celebrities such as Tom Cruise) are at best pathetic and at worst disturbing. If they truly feel that way, I think that they need to seek professional help. Some of them seem to be very kind and decent people, but I cannot suspend my disbelief enough to support their delusions.
Transrace (is that the term? I forget, it's been a while since I've seen any of them) people are in my experience simply offensive and/or ignorant, using their "true race" to validate cultural appropriation and special treatment.
To finish off, I'd just like to make it clear that I in no way support the trolling of 'kin! While I do sometimes giggle at some of them, I would never provoke them or contact them with intent to challenge their beliefs. Are they a bit silly? Yes, but as long as they don't cause anyone harm then they should be allowed to do as they wish. As I said, it seems to me that 'kin often have enough to deal with in their daily lives without people online adding to their woes.