I think that his words were mainly playing up to the media with an election around the corner.
There are ,however, some legimate areas of concern. Firstly, when MPs own homes and families are targeted by demonstrators / mobs and when some of their local surgery offices have been burned out or vandalised.
Secondly, the face to face and online threats and abuse that MPs of different political persuasions have been facing (the reason given by the Speaker saying he broke with normal protocol on the recent Parliamentary vote). And two MPs in recent years have been killed when just doing their jobs.
Thirdly, whilst the majority of the mass protesters in London are peaceful and lawful, the impact of social media communications has often caused all sorts of different factions to attend and sometimes those are violent or destructive or abusive. Social media seems to whip to up hatred. Even some largely peaceful protesters, such as Just Stop Oil, seem to think to acceptable to stop tube trains, block roads, vandalise and invade property, and stop people from going about their normal activity. I wouldn't fancy policing some of these activities, but the police and courts do seem inept, ineffective or inactive at times. Mind you, the Met seem incompetent in even properly vetting recruits to their ranks.
And all of the above is about trying to bully or force people to their point of view. Is that reached the threshold of mob rule? Perhaps not, but it still not acceptable.