Blood sport
Some would call it blood-sport, or a search for limits, or an attempt to permanently undermine the newcomer’s confidence and authority. When it is also male on female the label might go further. It s something unlikely to fall within the higher ideals of the Francis Report.
In case you wonder why the metaphor is of a boys’ school when very nearly half of MPs are women - it’s because poor behaviour in the chamber is overwhelmingly the province of men.
This Parliamentary ‘school class’ is new and so are half the ‘teachers’. Parliament began in November and because of summer and Covid-19 it’s only a few weeks old.