Toggle Font-Awesome Icon funktioniert nur bedingt Lösung 2

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<i onclick="myFunction(this)" class="fa fa-thumbs-up"></i>
<script>
function myFunction(x) {
x.classList.toggle("fa-thumbs-down");
}
</script>
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Obiger Code funktioniert leider nur bedingt. Klicke ich auf das Icon, verändert es sich auch, wie es soll (Daumen rauf wird zu Daumen runter). Komischerweise kann ich die Klasse aber nicht ändern. Wenn ich z.B. im HTML-Code aus class="fa fa-thumbs-up" -> class="fa fa-thumbs-down" mache und entsprechend im javascript-code aus x.classList.toggle("fa-thumbs-down"); -> x.classList.toggle("fa-thumbs-up"); mache, geht das Togglen nicht mehr. Wo liegt hier der Fehler?

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Der hier verwendete Code

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    <html>
  <head>
 <script src="/js_webseite/jquery.js"></script>
    <style>
      i{
  width:100px;
  height:100px;
  display:block;
  border:1px solid red;
  margin:0 auto;
  overflow:hidden;
}
i.fa-thumbs-down:before{
  display:block;
  height:100px;
  width:100px;
  line-height:80px;
  font-size:34px;
  background:green;
  color:white;
  content:'HOCH';
}
.fa-thumbs-up:before{
  display:block;
  height:100px;
  width:100px;
  font-size:33px;
  line-height:80px;
  content:'Runter';
  background:blue;
  color:white;
}
h2{
  text-align:center;
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