I thought I was bi at first for like two weeks lmao. But that was because I thought I liked men because that was all that I saw as growing up - I'm a woman, therefore I must like men. So me being homosexual was felt somehow impossible to me lmao. I agree with you, it is harmful for bi people, and as soon as I realised I wasn't bi (again it lasted two weeks lmao), I corrected the only person I told I was bi and told them I was mistaken and that I was a lesbian after all. But I fully support your opinion. What I mean by my comment is that I kind of "forgive" gay people who genuinely think they're bi until they realised they're not the same way I forgive bi people who have a really strong preference towards a certain sex and mistake it for monossrxuality and only later do they realise theyre bi. Which is harmful for homosexuals. It can happen both ways and we're not perfect. But I hate when gay or bi people acknowledge their attraction and misidentify themselves on purpose - that's the worst and cannot be tolerated.