Yes, one and all, Mrs Palmer, DR Ginny's mother-in-law, was something else. I adored her, but she was strong-willed, bossy, opinionated, and suffered no fools. I can just see her apoplexy after that Messiah.
I personally find countertenors an acquired taste, because most of them aren't that good. For Messiah, and most baroque music, I prefer a good contralto-mezzo-soprano. I suppose the most famous countertenor role in 20th century music is Oberon in Britten's opera A Midsummer Night's Dream, and I do not mind the sound there sionce it's part of his musical palette for the fairies.