Blocked for Asking a Tweeter for Citable Sources

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I got into a thread on Twitter yesterday with someone who pointed out that horses are native to and originally evolved on the American continent. While having been taught that this was true, I had also been taught that the horse had become extinct in North America by the end of the last Ice Age. When I pointed this out, the guy got very nasty, called me all sorts of names, posted an opinion piece on the subject with not a single citation or link to any scientific, academic, or paleontological evidence, and finished by calling me an armchair expert, and told me I was an ignorant SOB when I asked him for a reliable, citable source of information. So, since I understand that new findings come along all the time that change what we thought to be true based on previously available information, something too many people in this world don't get, I researched it myself. Come to find out that, indeed, current archeological and paleontological findings suggest that the native horse was indeed still around in what became the western US right up until and past the time of the first European invaders. Having thus educated myself, and having read the article describing the peer-reviewed doctoral thesis of a Native American scholar on the subject, I attempted to inform my antagonist that I now realized I was initially incorrect and am now better informed. He'd blocked me. It seems some people cannot abide having their facts checked.