It is not laughable. It is what the act actually says.
No it's not what the law says. It's what the website you found says, this is section 4a of the public order act:
4AIntentional harassment, alarm or distress.
(1)A person is guilty of an offence if, with intent to cause a person harassment, alarm or distress, he—
(a)uses threatening, abusive or insulting words or behaviour, or disorderly behaviour, or
(b)displays any writing, sign or other visible representation which is threatening, abusive or insulting,
thereby causing that or another person harassment, alarm or distress.
F2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(5)A person guilty of an offence under this section is liable on summary conviction to imprisonment for a term not exceeding 6 months or a fine not exceeding level 5 on the standard scale or both.]
Where does it's say 'directing it at a person'
Oh and here's a link to the Government CPS site if you think I'm lying
Public Order Act 1986
Like I said laughable