You should look up the legal definition of stalking. Making public observations isn't it.

Stalking: https://www.cps.gov.uk/legal-guidance/stalking-and-harassmen...

> Whilst there is no strict legal definition of 'stalking', section 2A (3) of the PHA 1997 sets out examples of acts or omissions which, in particular circumstances, are ones associated with stalking. For example, following a person, watching or spying on them or forcing contact with the victim through any means, including social media.

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Definition of stalking

Stalking is not legally defined but section 2A (3) of the PHA 1997 lists a number of examples of behaviours associated with stalking. The list is not an exhaustive one but gives an indication of the types of behaviour that may be displayed in a stalking offence. The listed behaviours are:

    (a) following a person,
    (b) contacting, or attempting to contact, a person by any means,
    (c) publishing any statement or other material relating or purporting to relate to a person, or purporting to originate from a person,
    (d) monitoring the use by a person of the internet, email or any other form of electronic communication,
    (e) loitering in any place (whether public or private),
    (f) interfering with any property in the possession of a person,
    (g) watching or spying on a person.

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I mean, that's pretty clear.