Not at all. Especially in semi-formal to formal writing, "about my joining" won't raise a single eyebrow. You might as well tell people that they must under no circumstances call something "all right," for fear that people who misspell that phrase as "alright" will be offended.Unfortunately for learners of English, this is one of the cases where native speakers do not agree on what is grammatically correct. Some insist on "about my joining". To please everybody, you have to avoid the structure altogether.
I regret to inform you that it will raise both my eyebrows. I will class the writer as stuffy, old-fashioned and elitist, and out of touch with how everyone I know speaks. I might let Keramus off, because he is not a native speaker.won't raise a single eyebrow
I don't think this is the structure. Me is the subject of the gerund joining, and the subjects of gerunds always take the me/him/her form. Consider the sentence Me/Him joining is what annoyed her. (This is another sentence that I would say, but that I would never write if I thought that sticklers might be reading.)mistaken impression that the pronoun is governed by the preposition
You're right that it's a gerund, but unfortunately a gerund is a noun, and nouns don't have subjects. "My" is correct because a possessive pronoun can modify a noun.Me is the subject of the gerund joining, and the subjects of gerunds always take the me/him/her form.
Unlike your typical noun, gerunds can have objects: (1) I am thinking about joining a club.a gerund is a noun, and nouns don't have subjects.
Whether or not they should is, I guess, an interesting question if you are in the position of having to invent a language for dwarves to speak in a fantasy book or something. The more important issue here, though, is whether or not they do; and the answer is that in standard English they don't.Why then should they not have subjects as well? I am thinking about Fred joining a club.
I would appreciate it if you gave your opinion about me joining your research team/group.