Anti-agreement Democratic Unionist Party assemblyman Edwin Poots, who was also protesting, said he wanted to send the message that neither Ms de Brun nor Mr McGuinness were welcome in Lisburn.
Once upon a time loyalty was said to be the Tories' secret weapon but in these devolved days the party's elected representatives are happy to wave placards protesting at their own government.
Half a dozen town halls were recently occupied by people protesting that their mayors were idle or corrupt, or possibly just because they belonged to a different political party.