Means you met a moron.

Not sure where you're located, but maybe he was expecting the fundie baby voice instead of, you know, a person. My guess is that he's insecure, and any woman who speaks with a modicum of confidence threatens his fragile masculinity.

I'm sorry to hear that happened to you. I think I "talk like a woman" and in certain areas make a conscious effort not to. Women tend to use more qualifiers and are less definite in their statements. I will be 100% right and still say "I think" or "maybe". It's the whole confident women are bossy women thing. It's not true at all, but there's still so much of that mentality.

They were probably just trying to say something offensive, but if it means anything it's likely just that you're confident and knowledgeable, because thanks to misogyny that's what we think men sound like and not what we think women sound like. Take it as a compliment if anything. It's possible you were just being effortlessly correct lol. And obviously that's what women sound like if you're a woman and that's what you sound like.

I'm guessing you have the audacity to speak more directly and unapologetically. For example, if you were at the table and you needed the salt, a stereotypical polite man way to say it would be "Pass the salt, please." And a stereotypical woman way might be "sorry, can you pass the salt, please?"

I'm not sure how deep this person's thoughts go, but she might be expecting some more "squee," cutesy or baby type phrases, said with a higher pitch instead of speaking with fewer qualifiers in a flatter tone.

My Reply to him: What a fking stupid thing to say, men never fail to surprise me with their stupidity.

Ah, I know. You didn't giggle enough. Or something.

That sounds like straight up sexism to me.

Seems like a fine community to post in, if you consider your self woman-identified. (See sidebar.)

Obviously, it's wrong to gatekeep ways people talk. That idiot should shut up -- you can talk however you like. But I'll answer the question you asked -- "what the fuck does that even mean?"

From a linguistic perspective, there is a notion of masculine and feminine speech patterns -- that is, phrases or words that are most frequently used by women and phrases that are most frequently used by men. In languages other than English, this is often easy to spot -- for instance, in japanese, there are pseudo-gendered first-person pronouns. Similarly, "umai" (tasty) is often considered more masculine than "oishii" (tasty). In English though, it's much less common. I could think of "honey" or "dear" -- e.g. "ohh, honey, no!" or "hello my dear" are rather feminine phrases -- in my life, I have mostly heard women use those words in that way, and when men use them they tend to be considered "effeminate." It's also apparently more common for men to say "uh" and for women to say "um."

There are probably subtle differences in how often various phrases are used by men vs women if you were to carefully make a tally -- but honestly why bother. That's just descriptivism. To say that men and women should speak in different ways is prescriptivist, and just plain wrong. So I wouldn't worry about the way you speak -- if somebody is upset with that, it is that person who is wrong, not you. As someone whose partner is a tomboy/butch woman, I must say I wouldn't expect her to switch to using more feminine speech patterns.

If it's concerning to you anyway, something you can keep in mind is the well-known linguistic phenomenon that new ways of speaking tend to flow from women to men more than vice versa. This is true in every culture studied so far as I know. For instance, it used to be considered an exceptionally feminine thing to say "like" all the time "he was like, ..." "that's so, like, ..." but now it's pretty ubiquitous. So if your speech doesn't sound feminine today, it might have sounded overtly feminine just 25 years ago.