As has been said, Johnson’s supporters don’t care about his lies. Many will also care even less about him being called out on it by a black woman, in fact I expect more than a few will be pleased that he’s winding up such a person leading to her getting expelled (btw I’m not suggesting she was actually would up and did this from lack of self control).
Say what if Starmer got himself expelled for doing it… I can somehow see such a thing damaging him more than Johnson.
I’m a bit concerned that the much of the general flak is directed at Johnson himself, rather than his cabinet and the government (as in all Tory MPs) which are allowing this to continue. He serves a useful purpose for the party in this sense, and can be replaced when necessary.