also disable reaction buttons in vanilla flavour

app/javascript/mastodon/components/status_action_bar.js

@@ -365,7 +365,7 @@ class StatusActionBar extends ImmutablePureComponent {
       <IconButton className='status__action-bar__button' title={intl.formatMessage(messages.hide)} icon='eye' onClick={this.handleHideClick} />
     );
 
-    const canReact = status.get('reactions').filter(r => r.get('count') > 0 && r.get('me')).size < maxReactions;
+    const canReact = signedIn && status.get('reactions').filter(r => r.get('count') > 0 && r.get('me')).size < maxReactions;
     const reactButton = (
       <IconButton
         className='status__action-bar-button'

app/javascript/mastodon/components/status_reactions.js

@@ -85,11 +85,14 @@ class Reaction extends ImmutablePureComponent {
 
   handleClick = () => {
     const { reaction, statusId, addReaction, removeReaction } = this.props;
-
-    if (reaction.get('me')) {
-      removeReaction(statusId, reaction.get('name'));
-    } else {
-      addReaction(statusId, reaction.get('name'));
+    const { signedIn } = this.context.identity;
+
+    if (signedIn) {
+      if (reaction.get('me')) {
+        removeReaction(statusId, reaction.get('name'));
+      } else {
+        addReaction(statusId, reaction.get('name'));
+      }
     }
   }
 

app/javascript/mastodon/features/status/components/action_bar.js

@@ -259,7 +259,7 @@ class ActionBar extends React.PureComponent {
       }
     }
 
-    const canReact = status.get('reactions').filter(r => r.get('count') > 0 && r.get('me')).size < maxReactions;
+    const canReact = signedIn && status.get('reactions').filter(r => r.get('count') > 0 && r.get('me')).size < maxReactions;
     const reactButton = (
       <IconButton
         className='plus-icon'