1. identify (or invent) a universally disliked or ridiculed group, no matter how few they are. 2. invent a link between them and your actual target. 3. knowingly blow them way out of proportion. 4. run an occasional two minutes hate to remind the target audience of their existence (which they can't do on their own, since there's like fifteen of them).
baby, you've got yourself a psyop going. you don't even need any elaborate false flag ops - just use the media you already control :^)