> There is no expectation of privacy in any place that is considered public.

Well that entirely depends on the country - in the UK it is true, but it wouldn't be true in Switzerland or Germany, where you do have the right to privacy even in public spaces.

> Then this is nothing else than you "not liking it".

The author knows what the laws are, but presumably disagrees with the reasoning behind the laws and is criticising them. If someone came to Switzerland and started complaining that they can't install a doorbell camera, then it would also be a case of them 'not liking it' - but they have a right to voice their opinion.