I’m sorry you feel that way, but “gay” sounds more offensive to me (e.g. “the gays” or “that’s gay”) and, ironically, euphemistic. LGBTQ sounds clinical (it’s an abbreviation!) and only half the letters relevant here.

Homosexuality is the most precise word (literally same-sexuality) to denote LG and DSM is hardly the originator of the word (the DSM was, is, and always will be, a mess. But that’s another issue).