I knew both MacColl and Dylan personally. When I let Dylan into the King and Queen club that night way back in 1962 he sang three songs which he didn't write in a pseudo Woody Guthrie style, complete with mouth organ and guitar. Nobody paid much attention except Martin Carthy who recognised Dylan from a a picture in Sing magazine. During the interval, at Dylan's request, we had a chat about folk music. He asked me if MacColl lived in a slum (I'm paraphrasing) and was surprised when I said he had a nice house in Beckinham .. I suspect Dylan was flying kites but he was obviously making a sly dig at MacColl.
So it would appear that Dylan had a preconceived perspective of MacColl before he sang in front of him and judging by what Bob sang that first night, MacColl would have been wrong in describing Dylan as McGonnalesque as there was nothing original about his first performance.