That's a perfectly fine thing to do. What bothers me is when I list my pronouns extremely clearly and people still call me "they", but even then the extent to which I mind has a lot to do with the vibe of the person calling me "they". When I get they'd on Hexbear/Lemmy, I generally assume that the person is just calling me "they" because they're subconsciously signaling that they don't know me, rather than out of some sort of transphobic impulse to deny my gender. I think there's a sort of "social distance" aspect to "they" that people don't really talk about.

If you know nothing else? That's probably fine. If the name is clearly masculine or feminine, I would recommend use masculine or feminine pronouns; names are usually something deliberately chosen and displayed, so gendering based off them is respecting that person's performance of gender.

If you know their pronouns, or if they ask you to stop using gender neutral terms for them, and you keep de-gendering them, that's where we start to get (justifiably) upset.

You're not using your psychic powers to figure out what the persons pronouns are? ... It's not fucked up, but like, you could just do that. (Real answer, I don't think it is)

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I think its usually fine, depends on the context. Id agree with Edie's comment too, but I've also been making an effort to just word my sentence to use the person's name or refer to that person as 'that person', or by other identifiers. small benefit of being less ambiguous, maybe itll catch on.