Can you shout theatre in a crowded fire?
>There is no right to the 'freedom of speech' in Thailand, so do not try to project Western ideals and sensibilities onto the situation.<
Our (UK) Freedom of speech allowance is pretty restricted too. No threatening, abusive or insulting speech or behaviour likely to cause a breach of the peace. No incitement to racial, religious or sexual hatred. No allowance to incite or glorify terrorism, nor collection or possession of info likely to be of use to a terrorist.
Treason is also a big no no, (including 'imagining the death of a monarch'), corruption of public morales and outraging public decency.
Tons of 'no free speech' rules dedicated to the courts of law, inc. but not limited to, scandalising the court by criticising judges, harassment, privileged communications, trade secrets, classified material, copyright, patents, military conduct, and limitations on commercial speech such as advertising.
'Facts' gleaned from Wikipedia.