BuddyPress.org

Ok, so what I am doing is that I am navigating you to the file where it is coded and I guess it can only be commented in the plugin code itself and we can not remove it by the hook.
File: https://github.com/WPPlugins/activity-reactions-for-buddypress/blob/master/class/class.php
on line 1044 and 1062

If it does not help then there are two filters on line 1165 and 1165, we can try removing them also.

Thanks