It is not uncommon for people to make alt accounts that look like their enemies. Some of these are to gather intel, but that’s just spying. And then some are meant for trolling.
Others are set up to make the enemy look bad. It’s really easy to do and can be surprisingly successful.
All you need to do is create an alt that looks like someone who is neutral or likeminded like the people you are going after. After that just post, either real or satirical stuff, to embarrass said person.