[MarkFL]

Okay, create a plugin as follows:

Product: vBulletin

Hook Location: postbit_display_complete

Title: Prevent Users From Access To Quote Button Of Users Ignoring Them

Execution Order: 5

Plugin PHP Code:

PHP Code:

if (in_array($vbulletin->userinfo['userid'], explode(' ', $post['ignorelist'])))
{
    $post['replylink'] = 0;
    $show['multiquote_post'] = 0;
} 


Plugin is Active: Yes

Bear in mind that this will not prevent more savvy users from manually entering the text to simulate quoting a user's post, but this will make it more difficult.