Diddles, if you were my mum, I'd have used every excuse not to meet up with you too.
In seriousness, I can understand it. People have bent over backwards to adhere to social isolation laws, staying away from friends and family for months now. They see one of the people behind the policy not only break that advice, but be flagrantly unapologetic about doing so.
"Incandescent with rage" is a massive overreaction, and quite likely a Diddlism (an exaggeration to try to score political points), but it I'd been effected like that, I'd be pished off too.